Preheat your oven to 350°F (175°C) and prepare two 9-inch round cake pans with baking spray.

In a medium bowl, whisk together the flour, baking powder, and salt until well mixed.

Cream the butter with granulated sugar for 3-5 minutes until light and fluffy, then mix in brown sugar.

Add in eggs one at a time and mix. Incorporate the vanilla extract.

Gradually mix in the dry ingredients with the milk, alternating until just combined. Fold in the chocolate chips.

Divide the batter between the prepared pans and bake for 30-35 minutes until a toothpick comes out clean.

Let the cakes cool in pans for 10 minutes before transferring to a wire rack.

In a large bowl, cream together butter, brown sugar, and powdered sugar until smooth. Add salt and vanilla extract.

Incorporate flour and milk into the frosting until it reaches a smooth consistency. Optionally fold in mini chocolate chips.

Level the cooled cake layers, stack with frosting in between, and cover the cake with the remaining frosting.