Ingredients:
- 1.5 cups (190g) all-purpose flour
- 1 cup (200g) granulated sugar
- 1.5 tsp (7g) baking powder
- 0.5 tsp (3g) salt
- 0.5 cup (113g) unsalted butter, softened
- 1 large egg (50g)
- 0.5 cup (120ml) whole milk
- 1 tsp (5ml) vanilla extract
- 0.25 cup (30g) rainbow sprinkles (jimmies)
- 1 cup (225g) unsalted butter, softened
- 3 cups (360g) powdered sugar
- 2 tbsp (30ml) heavy cream
- 1 tsp (5ml) vanilla bean paste
- 0.5 cup (60g) rainbow nonpareil sprinkles
Instructions:
- Cream the softened butter and sugar together on medium-high speed until the mixture looks pale and fluffy.
- Beat in the egg and vanilla extract until fully incorporated.
- Gradually add the flour, baking powder, and salt, alternating with the whole milk, mixing only until the streaks of flour disappear.
- Gently fold in the rainbow jimmies using a rubber spatula to avoid over-mixing.
- Grease the ramekins thoroughly and divide the batter equally between them.
- Bake at 350°F (175°C) for 28–33 minutes, or until a toothpick inserted in the center comes out clean and the edges begin to pull away from the sides.
- Cool the cakes in the pans for 10 minutes before transferring to a wire rack to cool completely.
- Whip the butter, powdered sugar, heavy cream, and vanilla bean paste until the frosting is stiff but spreadable.
- Apply a generous layer of frosting to the top of each cooled cake, smoothing it into a flat disc.
- Immediately pour a heap of nonpareils over the center and press them gently into the frosting using the palm of your hand or a flat spatula.