Preheat your oven to 375°F (190°C) and generously spray your muffin tin with [nonstick cooking spray]. My daughter Olivia always insists on being the official “spray supervisor.”
Gently press one slice of [deli ham] into each muffin cup, forming a little bowl. They don’t have to be perfect, mine never are, and they still turn out delicious.
In a large bowl, whisk together the [eggs], [milk], [salt], and [black pepper] until light and frothy. Olivia loves whisking, it’s her favorite “grown-up job.”
Stir in the [shredded mozzarella] and [cottage cheese] if using. This is where the magic happens, extra creamy, extra comforting.
If using, fold in [bell peppers], [spinach], or [green onions]. Olivia calls these the “tiny confetti pieces.”
Carefully pour the egg mixture into each [ham] cup, filling about ¾ full so they don’t spill over as they puff.
Bake for 18–20 minutes until the centers are set and the tops are lightly golden. The kitchen always smells like a cozy diner at this point.
Let the egg cups cool for 2–3 minutes before removing. The edges will be slightly crispy, and that’s