Step 1

Preheat oven to 375°F.

Step 2

Spray a 8-x-8-inch baking pan with baking spray.

Step 3

Add the flour, cocoa powder, baking powder and salt to a large bowl and whisk together until combined.

Step 4

In a separate bowl, beat together the eggs, sugar, butter, milk and vanilla.

Step 5

Pour the egg mixture into the flour mixture and stir just until combined.

Step 6

Pour into an ungreased 8-inch-square baking pan.

Step 7

Stir the brown sugar and cream soda together.

Step 8

Pour over the batter and bake 20 to 25 minutes, or until the sides are set but the center is still slightly jiggly.

Step 9

Let cool 15 minutes.

Step 10

Serve warm with ice cream.