Peanut Butter and Hot Fudge Pudding Cake

1/2 cup all purpose flour
1/4 cup sugar
3/4 teaspoon baking powder
1/3 cup milk
1 tablespoon vegetable oil
1/2 teaspoon vanilla
1/4 cup peanut butter
1/2 cup sugar
3 tablespoon unsweetened cocoa powder
1 cup boiling water
vanilla ice cream, hot fudge sauce and nuts, optional

In a medium bowl, combine flour, 1/4 cup sugar and baking powder. Add milk, oil and vanilla; stir until smooth. Mix in peanut butter. Pour into crockpot. In the same mixing bowl, stir together the 1/2 cup sugar and cocoa powder. Gradually stir in boiling water. Pour mixture over batter in crockpot. Do not stir. Cover and cook on high 2 to 3 hours or until a toothpick inserted comes out clean. Serve warm with vanilla ice cream, hot fudge sauce and top with nuts, if desired.