Easy Peanut Butter Cups From Martha Stewart 4 ounces white chocolate chopped or white chocolate chips ½ Cup smooth peanut butter 12 oz. semisweet or bitter sweet chocolate chopped or chocolate chips 2 Tbls. Chopped nuts 1. Line a 24 cup mini muffin pan. Melt white chocolate and the peanut butter in a microwave safe dish about 1-1 1/2 minutes until almost melted, stirring halfway through. Set aside and cool slightly. 2. Melt chocolate in another microwave safe bowl about 2-3 minutes, stirring once or twice. 3. Layer chocolate, peanut butter and chocolate into muffin cups. Sprinkle with chopped nuts. Put in freezer for about 15 minutes.