Coffee Cake Cookies

Ingredients

• 1/2 cup all-purpose flour
• 1/3 cup packed brown sugar
• 1/2 tsp. baking powder
• 1/2 tsp. baking soda
• 1 large egg
• 2 Tbsp. unsalted butter (melted)
• 1/4 cup sugar
• 1 tsp. vanilla extract
• 1/4 cup cake flour
• 8 Tbsp. unsalted butter (cold, cubed)
• 1 tsp. cornstarch
• 5 Tbsp. unsalted butter (softened)
• 3 Tbsp. heavy cream
• 1 tsp. cinnamon
• 1/2 tsp. salt
• 1 cup powdered sugar (sifted)
• pinch salt
• 1 large egg yolk