With a candy-bar-inspired top and a crumbly cookie base, each of these rich squares packs a double dose of that perfect pairing: chocolate and peanut butter.

YIELD:Makes 2 dozen

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

DIRECTIONS

STEP 1
Coat a 9-by-13-inch baking dish with cooking spray. Line with parchment, leaving a 2-inch overhang on the 2 long sides.

STEP 2
Combine wafers, oats, sugar, and salt in a large bowl. Melt butter in a medium saucepan over medium heat, then add chunky peanut butter and 3/4 cup smooth peanut butter, whisking until well combined. Add peanut butter mixture to wafer mixture, stirring until combined. Transfer to baking dish, and use the bottom of a measuring cup or an offset spatula to firmly press mixture into an even layer. Refrigerate for 30 minutes.

STEP 3
Pour melted semisweet chocolate over chilled mixture and, using an offset spatula, spread into a thin layer that covers the entire surface. Refrigerate until hardened, at least 15 minutes.

STEP 4
Heat remaining 3 tablespoons smooth peanut butter in a small saucepan until runny. Drizzle peanut butter over chilled chocolate. Drizzle melted milk chocolate over peanut butter. Refrigerate until hardened, about 15 minutes.

STEP 5
Use parchment to lift out chilled block of bars. Run a sharp knife under hot water, dry well, and cut into 24 squares, wiping knife between cuts. Let bars stand at room temperature for 10 minutes before serving.