Roll out the pie crusts on a lightly floured surface. Use a 4-inch cookie cutter to cut out circles and fit them into a greased 12-cup muffin tin.

Preheat your oven to 375°F (190°C).

In a large mixing bowl, whisk together eggs, milk, and heavy cream until frothy. Add salt, pepper, and cayenne.

Gently fold in spinach, chopped onion, diced ham, and shredded cheese into the egg mixture.

Pour the egg and filling mixture into each crust, filling them about three-quarters full.

Bake for 25-30 minutes until the centers are set and edges are lightly golden brown.

Let the quiches cool in the tin for about 10 minutes before serving.