Prepare the ingredients: measure out the flour and sugar. Allow the butter to soften at room temperature.
In a bowl, cream together the butter and sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition.
Sift the gluten-free flour and baking powder into the egg mixture, then add the vanilla extract and milk. Mix until smooth.
Divide the batter into three equal portions and color each with a different shade of food coloring to achieve the ombre effect.
Pour the first layer of batter into a greased and parchment-lined cake pan and bake at 350°F (180°C) for 15 minutes. Repeat with the remaining colored layers.
While the cake layers are cooling, prepare the frosting: whip the heavy cream until stiff peaks form. Gently fold in the mascarpone cheese and powdered sugar.
Layer the cooled cake layers, spreading each layer with the mascarpone cream frosting. Ensure the frosting is evenly distributed.
Frost the outside of the cake with the remaining cream. Refrigerate for at least 2 hours to allow the flavors to meld and the frosting to set.
Before serving, decorate the cake with food coloring, edible flowers, or sugar pearls, if desired.
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