No-Bake Chocolate and Peanut Butter Oatmeal Bars

INGREDIENTS

• Vegetable oil cooking spray
• 9 ounces chocolate wafers (about 40 wafers), finely ground (2 cups)
• 1 1/2 cups old-fashioned oats
• 1 1/4 cups confectioners' sugar
• 1/4 teaspoon coarse salt
• 5 ounces (1 stick plus 2 tablespoons) unsalted butter, cut into small pieces
• 1 cup chunky peanut butter
• 3/4 cup plus 3 tablespoons smooth peanut butter
• 10 ounces semisweet chocolate, melted
• 1 1/2 ounces milk chocolate, melted