Double Chocolate Frozen Fudge Pops

½ cup white sugar

2 tablespoons cornstarch

2 tablespoons cocoa powder

2 ½ cups whole milk

1 teaspoon vanilla extract

1 tablespoon butter

¼ cup miniature semisweet chocolate chips

Combine the sugar, cornstarch, cocoa powder, and milk in a small saucepan over medium heat. Bring to a simmer, and stir until thick, about 2 minutes. Remove from heat; stir in vanilla and butter. Transfer to a heatproof bowl, and refrigerate until cool, approximately 20 minutes.

Stir the chocolate chips into the cooled chocolate mixture. Pour into molds and freeze until firm, about 4 hours.