Roll out pie crusts on a lightly floured surface and cut out 4-inch circles. Grease a muffin tin with butter and press dough circles into each cup. Freeze while preparing the filling.

Preheat your oven to 375°F (190°C) while gathering filling ingredients.

In a mixing bowl, whisk together eggs, milk, cream, salt, and pepper. Add cayenne, spinach, onion, ham, and cheese. Mix until blended.

Fill each muffin cup with the filling, leaving ¼ inch from the top. Bake for 25 to 30 minutes until puffed and golden brown.

Let cool in the pan for 10 minutes before carefully removing and serving warm or allowing to cool completely.