For the best texture and flavor, cook the bacon to your preferred level of crispness before baking it into the frittata so it stays pleasantly crunchy instead of turning chewy. If your bacon is very salty, reduce the added salt in the egg mixture and adjust to taste after baking. Freshly shredded cheese melts more smoothly and creates better pockets of gooey richness, but good quality pre shredded cheese will still work in a pinch. To reheat leftovers, warm a slice in a 350°F oven or toaster oven for 5 to 10 minutes to revive the crisp edges, or microwave briefly if you are short on time. This sheet pan frittata is delicious on its own or paired with simple low carb sides like leafy green salads, sautéed spinach, or roasted non starchy vegetables.