Crockpot brownies

I've always read the recipes for baking in a crockpot and wondered how it would work so this was my first attempt and it didn't fail miserably but it did fail...the outside edge was done but none of the center. However; what was done tasted quite good:)

Walnut Brownies Crockpot Recipe

Ingredients
2 egg

1 cup water

1/2 cup oil

1 cup brown sugar

1/4 cup melted butter

1/2 cup chopped walnuts

1/4 cup cocoa1 package of brownie mix

Directions
First, mix the butter, oil, sugar, water and cocoa in a sauce pan till cocoa is well mixed. Add this to a bowl with the eggs, packaged brownie mix, and walnuts and then beat until a smooth texture is formed. Grease the inner stoneware of the Crockpot and pour the batter into it. Turn the Crockpot on high for 1 1/2 hours and let stand for 30 minutes with heat turned off.