Preheat the oven to 350 degrees.

Let the pie crust come up to room temperature, then unroll it and press it into a 9 inch pie pan, pinching up the edges to form a decorative rim.

In the bottom of the prepared crust, place the spinach, tomatoes, ham and onions. Top with shredded cheese.

Mix the eggs and milk in a medium sized bowl, and add salt and pepper to taste.

Pour the egg mixture into the pie crust over the top of the quiche fillings.

Bake for 45-60 minutes, or until the center is cooked and a knife inserted into the quiche comes out clean.