Preheat your oven to 325°F (160°C). Grease and flour two 8-inch round cake pans; line the bottoms with parchment paper.

In a large bowl, whisk together flour, sugar, baking powder, and salt. Cut in butter until mixture resembles coarse crumbs.

Add egg whites, sour cream, oil, almond extract, and vanilla. Mix until smooth and beat for 30 seconds.

Divide one-third of the batter and color with red and green gel food coloring.

Pour colored batters into prepared pans and bake for 35-40 minutes. Cool on a wire rack.

Use a serrated knife to level cooled cake layers for stacking.

Beat butter until fluffy. Add extracts and salt. Slowly mix in powdered sugar and cream until pipeable.

Stack layers with buttercream. Insert dowel if needed. Apply crumb coat and chill.

Divide and color portions of buttercream: white, ivory, red, yellow, and black.

Pipe red around sides for Santa suit. Add black belt, yellow buckle, arms, hands, hat, beard, and face features. Use various tips for texture.