There are many reasons to love a good frittata for lunch or dinner. First, they're quick and require little active cooking time. Second, you usually already have the ingredients on hand. Third, frittata leftovers make a great sandwich, and slices are portable for on-the-go breakfasting or snacking. When I think about what to fold into my frittata, cheese is the first point of consideration. Really, isn't cheese always the first point of consideration?