Chocolate Brownie Cake with Peanut Butter Frosting

Ingredients (11)

• 1 box fudge brownie mix (make sure it's a family size) plus the eggs, oil, and water called for on the box OR Use your favorite homemade recipe
• 1 box chocolate cake mix plus eggs, oil, and water called for on the box OR Use your favorite homemade recipe
• 1 cup creamy peanut butter
• 2 8 oz. packages cream cheese, softened
• 4 Tablespoons butter, softened
• 1 Tablespoon vanilla
• 8 cups sifted powdered sugar
• 4-6 Tablespoons half and half
• 4 ounces chocolate
• 1/2 cup heavy cream
• Peanut butter chips (optional)