Peanut Butter Fudge Bars

Bahan-bahan (15 porsi)

• One 15.25-ounce box yellow cake mix
• 1 cup creamy peanut butter
• ½ cup (1 stick) + 2 tablespoons unsalted butter, (melted (divided))
• 2 large eggs
• One 14-ounce can sweetened condensed milk
• 2 teaspoons vanilla extract
• ½ teaspoon salt
• 12 ounces semisweet chocolate chips
• 1 cup shredded coconut
• 1 cup finely chopped walnuts or pecans