Preheat oven to 350ºF and place an oven rack in the center position if you don't have it there already. Spray 2 muffin tins with oil or cooking spray.
Place 1 wonton wrapper in each cup of the muffin tin, then place a second wrapper in each tin with the corners facing in the opposite direction. Spray the "crusts" with oil, making sure the corners are well-coated, then divide cheese, spinach, and artichoke hearts into each cup.
Whisk together the eggs, milk, salt, and nutmeg in a small bowl with a spout or a large measuring cup. Carefully pour the egg mixture into each wonton crust.
Bake the mini quiches for 12-15 minutes on the middle rack, or until the corners of the wontons are browned and crisp and the centers are cooked set. Let the quiches cool for 5 minutes, then serve.
Notes
If you're not serving them as an appetizer, these quiches make a great grab-and-go breakfast.To freeze them, cool the quiches on a wire rack, then place them in freezer bags or an airtight plastic container.To serve, place the frozen quiches on a baking sheet and bake them at 350ºF for about 15 minutes, or until warmed through. To microwave, place 2-3 quiches on a small plate and microwave 30 seconds at a time or until heated.
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