Line a baking sheet or your countertop with waxed paper or parchment paper.
Combine the dark chocolate, semi-sweet chocolate, and solid vegetable shortening in a medium-size microwave-safe bowl.
Microwave in 30-second increments stirring after every 30 seconds until the chocolate is melted and smooth.
Add the Cheerios and stir them with a spatula until are well-coated in chocolate and no dry spots remain.
Using a small spring release scoop or teaspoon, drop small teaspoonfuls onto the waxed paper.
If you want to add any decoration on top sprinkle it on while the chocolate is still wet.
Allow the candy to dry before serving or storing.
Store the candies in an airtight container for up to a month. You can store in the refrigerator or countertop. If you store them in the refrigerator, allow them to come to room temperature before serving.