To choose the best quiche cheese, first consider your favorite flavors. If you like strong cheese, you can add a few milder cheeses to use in a quiche. If you prefer mild cheese, adding a small amount of a stronger variety can help ensure your quiche will have enough flavor. Since quiches are egg custard pies that are basically quite bland with subtle seasoning, the cheese should provide a dominate taste while still allowing the flavor of the eggs, seasonings and vegetables to come through. Especially if you prefer to use only one quiche cheese at a time, Gruyere is an excellent as well as classic choice.
A sweet, salty cheese, Gruyere becomes stronger the more it's aged. It also melts well and has the savory qualities to enhance rather than overpower the other quiche ingredients. If you can't get Gruyere quiche cheese, Emmental or Swiss can work well although they're a little stronger. Muenster cheese is another traditional choice for quiche that can range from mild to strong depending on how it's aged. Other strong cheeses that can work deliciously well in quiche include blue or bleu, Parmesan, aged cheddar and Asiago.
Asiago, cheddar and Parmesan together along with the milder mozzarella to even out the flavors can make a great cheese blend for quiche as well as other dishes. Some cooks enjoy Parmesan sprinkled on the top for a quiche cheese that forms a cheesy crust. Bleu or blue cheese could be placed in a blend, but it's often used alone in quiches to enhance smoky meat ingredients such as bacon or interesting vegetables like leek or asparagus. A strong, salty cheese like feta mixes well with spinach and mushrooms in a quiche.
Mild quiche cheeses to blend in with strong ones include Colby and Monterey Jack although mozzarella is a popular choice as well. If you use too much mozzarella as a quiche cheese though, you may find there is too much "stretchiness" reminiscent of pizza. For showcasing the rich flavors of ingredients such as smoked salmon, caramelized onions and/or dill weed in quiches, the subtle taste of havarti can be a good fit. Havarti cheese also tends to bring out tomato flavors in quiche.
If you plan on adding fruits such as apple or pumpkin to a quiche, choose a cheese with a hint of sweetness such as brie. Brie can also be a delicious quiche cheese with red peppers or caramelized onions. For sweet quiches, the Greek cheese myzithra can be an ideal choice. It also works well with eggplant.