Preheat oven to 400F.
Once you have thawed your puff pastry, on a floured surface, flatten the dough with a floured rolling pin until quite thin, and covers about a 12x12 inch area.
Using a circle cutter, or mouth of a cup, cut circles out of the puff pastry large enough to fill the bottom of a muffin tin.
Place puff pastry in the bottom of each muffin cup. You should be able to fill 12-15 cups.
Whisk your eggs in a bowl, add salt & pepper.
Now begin layering your ingredients on top of the puff pastry. I layered ham, spinach, mushroom, red pepper, green onion, then poured in 2-3 tablespoons of egg, and topped with a generous amount of shredded cheese.
Bake in the oven at 400F for about 20-25 minutes until it has puffed and cheese becomes golden brown on top.
Remove the mini strata with a spoon and serve!