Cookie layer

Preheat the oven to 350F then line an 8×8 baking pan with parchment paper or foil. Set side.
In a large bowl, cream the butter, granulate sugar, and brown sugar together until smooth and creamy. Add in the egg, the vanilla extract, and the almond extract and mix to combine.
½ cup butter,½ cup granulated sugar,2 tablespoon brown sugar,1 large egg,¼ teaspoon almond extract,2 teaspoon vanilla extract
Mix in the flour, baking powder, salt, and cornstarch just until the flour mixture barely disappears. Spread the batter into the prepared baking pan and bake in the preheated oven for 15 minutes. The center will still look raw but don’t worry these bars will continue baking as they cool down.
½ teaspoon baking powder,1 cup all purpose flour,3 tablespoon cornstarch,¼ teaspoon salt

Frosting

In a large bowl, whip the softened butter, and powdered sugar together until combined. Add in the heavy cream and vanilla and whip until light and fluffy.
4 tablespoon butter,1 teaspoon vanilla exract,3 tablespoon heavy cream,1 cup powdered sugar
Frost the sugar cookie bars with that then top with sprinkles. slice and serve if you prefer your frosting on the softer side or chill them a bit to allow the frosting to set before enjoying.
Christmas sprinkles