Chocolate Peanut Butter Marble Cake

Ingredients (10)

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