Crock Pot Hot Fudge Cake

Ingredients

• 1 cup all-purpose flour
• 2 teaspoons baking powder
• 1/4 cup butter
• 1/3 cup chocolate chips
• 2/3 cup & 1/3 cup granulated sugar
• 3 tablespoons & 1/4 cup cocoa
• 1 tablespoon vanilla extract
• 1/4 teaspoon salt
• 1/3 cup milk
• 1 egg yolk
• 1/3 cup brown sugar
• 11/2 cups hot water
• Whipped cream or ice cream, optional but you'll want it!