Step 1

Preheat oven to 350f degrees.

Step 2

Spray a 9 x 9 square pan with nonstick baking spray.

Step 3

In a large bowl, mix together all the dry ingredients (flour, sugar, baking cocoa and baking soda)

Step 4

In a separate bowl, whisk together water, mayonnaise, vanilla extract and coffee.

Step 5

You just want to use plain, brewed coffee - no additional milk or sugar added.

Step 6

Slowly add the liquid mixture into the dry ingredients.

Step 7

Stir just until combined.

Step 8

Pour into prepared baking dish.

Step 9

Bake for about 30-35 minutes (until a toothpick inserted comes out clean).

Step 10

Once the cake is finished, start preparing the frosting.

Step 11

In a medium saucepan, over medium heat, combine brown sugar and butter and cook until bubbly. Be sure to whisk constantly so it doesn't burn.

Step 12

Take off the heat and stir in the milk.

Step 13

Then gradually add in powdered sugar.

Step 14

Whisk until smooth.

Step 15

Frost the cake!