These savory little gems will be the first party appetizer to disappear. Make ahead the day before and refrigerate, or you can freeze them up to 3 weeks in advance. If frozen, pop in the oven straight from the freezer and increase the bake time by 10 minutes. We find that sharp cheddar works best for creating a super cheesy flavor, but feel free to experiment with your favorite flavor of cheddar--an aged white cheddar would be amazing here. These are guaranteed to be one of the best easy appetizer recipes you've ever made.