Preheat oven to 350 degrees.
4tsp baking powder
1 1/2C milk
1/2C butter, melted
Butter or line with parchment a 13 X 9 pan.
In a large bowl mix dry ingredients together.
Mix in the eggs and milk.
Slowly stir in butter and pour into a greased 13 X 9 pan.
1C butter, softened
1C brown sugar
Mix topping together until well combined. Drop evenly over batter. Swirl with a knife.
Bake at 350 degrees for 28-32 minutes.
2C powdered sugar
Mix together and drizzle over warm cake.