Combine sugar, corn starch, cocoa powder and salt in a small saucepan.  Mix well.  Whisk in milk.  Cook over medium heat, stirring constantly, until mixture comes to a boil for 1 minute.  Remove from heat and add chocolate chips, butter and vanilla extract.  Let sit for 2 to 3 minutes and then stir until well mixed.

Let cool for 20 minutes.  Portion into popsicle molds. Freeze for 2 to 3 hours or until solid.  Unmold and enjoy!

Recipe Tip:  Substitute small (2 to 3 ounce) paper cups for popsicle molds.  Freeze 1 hour, then insert a wooden popsicle stick in the center of each.

Variations:

Mint: add 1/2 teaspoon mint flavoring in place of vanilla

Peanut butter: Replace1-1/2 tablespoons milk chocolate chips with peanut butter chips

Spicy: Add 1/2 teaspoon cinnamon and 1/8 teaspoon cayenne

Mocha:  Add 1 teaspoon instant coffee with the dry ingredients.