Chocolate Peanut Butter Marble Cake

Ingredients

• ✓ ¼ cup unsweetened cocoa powder
• ✓ 2 tablespoons confectioners' sugar
• ✓ 2 tablespoons butter, softened
• ✓ 2 tablespoons hot water
• ✓ 1 cup peanut butter chips
• ✓ 1 tablespoon shortening
• ✓ 1 (18.25 ounce) package white cake mix
• ✓ ½ cup packed brown sugar
• ✓ 1 ¼ cups water
• ✓ 3 eggs