Rainbow Sugar Cookies

I made these colorful sugar cookies to bring to my friend’s St. Patrick’s Day party. She is always very festive and embraces every holiday with wonderful decorations and fun crafts.

Her 12-year old daughter even made this Leprechaun appetizer for the celebration. Amazing! 🙂

These cookies were originally called “End of the Rainbow” cookies in Martha Stewart Living. They had little candy “pots of gold” attached with icing. I preferred them plain! I added the colored sanding sugar on the outside of the cookie dough log instead. I also used a tried and true sugar cookie dough, from our birthday Number Cookies, but used the technique from the magazine to color and form the dough into rainbows.

I pre-cut the dough into semi-circles prior to baking but had to trim the bottom after baking to create a straight edge. Next time, I would bake them in full circles and cut them in half immediately after removing them from the oven instead. We did get to sample the cookies by eating all of the trimmed edges! 😉

  • 2 sticks (1/2 pound) unsalted butter, room temperature
  • 1 1/2 cups sugar
  • 1 large egg
  • 1/2 tsp pure vanilla extract
  • 3/4 tsp coarse salt
  • 2 1/2 cups all-purpose flour (10.6 oz)
  • gel food coloring (I used blue, yellow, and pink)
  • 1 large egg, yolk and white separated
  • colored sanding sugar (I used yellow)
  1. In the bowl of an electric mixer fitted with the paddle attachment, beat butter and sugar on medium-high speed until light and fluffy, about 5 minutes.
  2. Add eggs, vanilla, and salt; mix on medium-high speed until combined.
  3. With mixer on low speed, add flour in two batches, mixing until just incorporated.
  4. Divide dough in half, about 1 pound each.
  5. Divide one half into 2 pieces, about 3/4 cup each. (I used a kitchen scale to divide it evenly.) Flatten one piece into a 3-by-5-inch rectangle; wrap tightly with plastic. Roll out other piece into an 8-inch rod shape, about 1 inch thick; wrap tightly with plastic.
  6. Divide remaining half of dough into 3 pieces, about 1/2 cup or about 5.8-6oz each. Tint each with one of the gel colors, as desired, stirring color in with a knife or spatula.
  7. Flatten each tinted piece into a 3-by-5-inch rectangle; wrap each tightly with plastic.
  8. Refrigerate all dough until firm, at least 2 hours and up to 2 days (or freeze up to 1 month).
  9. In a small bowl, whisk egg white with a fork.
  10. Between sheets of plastic wrap, or on a lightly floured work surface, roll out the blue dough into a 4 or 5-by-8-inch rectangle, a scant 1/4 inch thick.
  11. While still enveloped in the plastic wrap, make sure that the edges meet after wrapping the log in the tinted dough; adjust if necessary.
  12. Unwrap and brush the top with egg white. Place dough rod on long edge of rolled-out dough, then roll rod inside it; seal at edges where dough meets by pinching and pressing gently. Freeze 10 minutes.
  13. Repeat with remaining dough, rolling yellow dough out to 5 or 6-by-8 inches, pink dough to 6 by 8 inches (1/8 inch thick), and un-tinted dough to 7 or 8-by-8 inches.
  14. Roll log in plastic wrap; twist ends closed. Freeze until solid, at least 4 hours and up to 1 month.
  15. Preheat oven to 350 degrees, preferably on convection.
  16. Let log soften at room temperature about 10 minutes; remove plastic wrap.
  17. In a small bowl, whisk egg yolk with a fork. Coat the outside of the log with the egg yolk and sprinkle with sanding sugar.
  18. Using a sharp chef’s knife, slice 1/4 inch thick, rotating log slightly after every slice to maintain even circles.
  19. Place slices on parchment-lined baking sheets and bake until firm and just golden around edges, about 9 to 12 minutes.
  20. Immediately after removing the cookies from the oven, cut each cookie in half with a sharp knife to form two rainbows.
  21. Let cool on sheet 10 minutes, then transfer to a wire rack and let cool completely.

11th Birthday Rainbow Sprinkle “Fluffy” the Unicorn Cake

We try to be as fair as possible in our house…

So, while I’m sharing birthday treats, I am going to have to share my daughter’s 11th birthday cake too. Her birthday was in November! (I’m very behind on my posts…)

The bright side of having my daughter turn 11-years old was that she was mature enough to choose going to a Broadway show over having a birthday party. 🙂 We saw Aladdin!

The down side of having my daughter turn 11-years old was that she was mature enough to browse Pinterest for birthday cake ideas. 😉

Her Pinterest search resulted in another Universal Studios inspired birthday dessert. (We actually celebrated her birthday before having my son’s Harry Potter World Butterbeer Cupcakes, so maybe she actually inspired his dessert choice!) It was a very unicorn-themed day, complete with unicorn pajamas, unicorn slippers, and many horn “accessories” for other animals. 🙂

I used the Rainbow Sprinkle Cake recipe that we enjoyed last year on her birthday to create a “Fluffy” the Unicorn cake. It just makes sense that a unicorn cake involve rainbows in some way. For those of you who don’t know, this unicorn is from the Despicable Me and Minions movies. I doubled the recipe to make 2 1-pound loaves of cake for the head and body. I also made 4 cupcakes for the legs using the same batter.

The eyes, ears, and tongue were made using dough from my batch of unicorn and “11” Number Cookies. The horn was made with molded rice krispie treats. I also used rice krispie treats to support the position of the head. Rainbow candy was used for the mane and tail- this was a subtle but fun deviation from the actual unicorn from the movies. Pretty cute! 🙂

For the Cake:

  • 1 cup/220 grams unsalted butter (2 sticks), slightly softened, more for pans
  • 3 cups/380 grams all-purpose flour, more for pans
  • 2 teaspoons baking powder
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon fine salt
  • 1 1/3 cups/316 ml whole milk
  • 3 teaspoons pure vanilla extract
  • 2 cups/400 grams sugar
  • 2 whole eggs plus 4 egg whites
  • 2/3 cup rainbow sprinkles (not pastel, or naturally colored)

For the Cream Cheese Frosting:

  • 24 ounces cream cheese, slightly softened
  • 1 1/2 cups/330 grams unsalted butter (3 sticks), slightly softened
  • scant 1/2 teaspoon fine sea salt, more to taste
  • 9 cups/900 grams confectioners’ sugar, sifted, more to taste
  • 1 1/2 teaspoons pure vanilla extract

For the Decorations:

  • sugar cookie eyes, ears, and tongue
  • rice krispie treats (store-bought or homemade)
  • gold sprinkles
  • “air head” rainbow candy
  • red gel food coloring
  • chocolate chips

  1. Make the cake: Heat oven to 325 degrees, preferably on convection, and place a rack in the center.
  2. Butter and line the bottoms of two 1-pound loaf pans with parchment paper. Butter the parchment. Flour the pans, coating the bottom and sides, then tap out any excess flour. Coat 4 muffin pan wells with cooking oil spray.
  3. In a medium bowl, whisk together flour, baking powder, baking soda and salt.
  4. In a small bowl, stir together milk and vanilla.
  5. In a mixer fitted with the paddle attachment, beat butter and sugar at medium-high speed until light and fluffy, 2 to 3 minutes.
  6. Reduce speed to low and, with mixer running, slowly add egg and whites and beat until smooth and creamy, 1 to 2 minutes. Scrape down bowl.
  7. Add half the flour mixture, then the milk mixture, then the remaining flour mixture, beating to blend after each addition.
  8. Scrape down bowl and blend once more.
  9. Remove bowl and use a spatula or spoon to fold in sprinkles by hand.
  10. Fill the 4 prepared muffin pan wells about 2/3 full. Bake until the a toothpick inserted into the center comes out clean, 16 minutes.
  11. Divide remaining batter evenly between the pans (approximately 1190 g per pan), and bake until the tops are just dry to the touch and a toothpick inserted into the center comes out clean, 45 to 50 minutes. Rotate the pans halfway through baking.
  12. Transfer pans to a wire rack and let cool completely, at least 2 to 4 hours, before turning out.
  13. Make the frosting: In a mixer fitted with the paddle attachment, beat cream cheese, butter and salt together at medium speed until light and fluffy, 2 minutes.
  14. Reduce speed to low and, with mixer running, slowly add sugar and beat until smooth.
  15. Beat in vanilla just until incorporated.
  16. Taste frosting; you should be able to taste the cream cheese and a little bit of saltiness, as well as the sweetness. If desired, add more salt or sugar. Keep refrigerated.
  17. Turn cooled cakes out of pans.
  18. Slice loaves in half and spread icing between the layers.
  19. Place cakes on a platter positioned as a head and body. (I made a support ramp with rice krispie treats.)
  20. Using an offset spatula, frost the top surface as a crumb coat.
  21. Form the horn with one rice krispie treat, ice and cover with gold sprinkles. (I microwaved the rice krispie treat for 10 seconds to make it easier to mold. I also coated my hands with cooking spray!)
  22. Refrigerate until firm.
  23. Using a pastry bag and a star tip, place remaining frosting all over the cake.
  24. Color remaining frosting pink and ice the cupcake legs/feet. Top the cupcakes with sugar cookie and place on the cake.
  25. Decorate with cookie eyes, ears, and tongue.
  26. Pipe the pink decorative stripe on the snout.
  27. Using melted chocolate, pipe the nostrils.
  28. Using a star pastry tip, fill in the “fluffy” fur with the frosting over the head and body.
  29. Use either remaining pink frosting or rainbow candy, form the mane and tail.
  30. Refrigerate cake 30 minutes or longer to set. Serve cool.

One Year Ago: Rainbow Sprinkle Cake & a Festive “Candy Shop” Themed Birthday Party

Two Years Ago: Pig Party!

Three Years Ago: Birthday Red Velvet “Owl” Cupcakes

Four Years Ago: The Best Birthday Cupcakes  &  Apple Layer Cake with Maple-Cream Cheese Frosting

Five Years Ago: Birthday Cake Gallery

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