Life-saving breakfast quiches/egg muffin cups

This recipe is the greatest! In deliciousness and practicality. Win-win for those of us who do too much... but also love breakfast. I refer to them as "egg muffins," but I don't think that's an accurate name since muffins are defined as being made from a batter or dough (yes, I Googled "muffin definition" for this post. Ha!). They're sort of like quiches, but I always think of quiche as having