Malted Butter Riches

2 cup all-purpose flour ⅔ cup malted milk powder 1 teaspoon baking soda 1 teaspoon salt ¾ cup unsalted butter, softened ¼ cup shortening ¾ cup packed light brown sugar 1 tablespoon vanilla 1 egg 1 egg yolk Whole or crushed malted milk balls (optional)

Malted Brown Butter Frosting

¾ cup unsalted butter 4 cup powdered sugar 1 cup malted milk powder ½ teaspoon salt 2 teaspoon vanilla ½ - ⅔ cup heavy cream