The BEST Christmas Cookie Bars - Crazy for Crust

• 2 Eggs, large

• 2 cups All-purpose flour

• 1 tsp Baking powder

• 2 cups Brown sugar, packed

• 1/2 tsp Salt

• 1 tsp Vanilla extract

• 1/2 cup Butter, unsalted

• 1 cup Christmas m&ms

• ½ cup Christmas sprinkles (use jimmies for best results)