This Chocolate Fudge recipe from our friends at Allrecipes is equal parts simple and delicious, and the perfect way to mark National Fudge Day on June 16.

In a large microwave-safe bowl, combine 3 cups semisweet chocolate chips, one 14-ounce can sweetened condensed milk, and 1/4 cup unsalted butter (cut into pieces). Microwave on medium heat until chips are melted, about 3 to 5 minutes, stirring a few times.

Grease an 8-inch square glass baking dish. Remove chocolate mixture from the microwave and stir in your favorite add-ins, such as 1 cup chopped walnuts or mini marshmallows.

Pour mixture into prepared baking dish and refrigerate until set, about 2 hours. Cut into 16 squares and enjoy!