Budget Veggie Frittata

The center has to set. A pretty top is not a thermometer.

Whisk eight eggs with a quarter cup of milk, salt, pepper, and dried Italian herbs. Cook onion and pepper in an oven-safe skillet, add garlic and spinach, pour the eggs over, add cheese, cook on the stove until the edge sets, then bake at 375°F until the center is firm. USDA FSIS lists eggs at 160°F. FDA says cook eggs until the yolk and white are firm and cook egg dishes thoroughly, using a thermometer. A frittata that jiggles like custard in the middle is not done. Leave it in the oven. If the top is dark, tent it. People who are pregnant, older, very young, or immunocompromised should not eat the soft center. There is no "Italian restaurants serve it soft" exception on the FDA page.

An oven-safe skillet means the handle survives 375°F. If it does not, start the vegetables in any pan and pour the eggs into a greased pie dish to bake. The temperature target does not change.

Spinach, cheese, and sodium

Fresh spinach wilts in a minute. Frozen spinach has to be thawed and squeezed or the eggs turn watery and do not set. Watery eggs are how the center stays under temperature while the edge dries out. Cheese is salty. The Dietary Guidelines for Americans, 2020 to 2025, say to limit sodium. You can use less than half a cup. The eggs will still bake.

The card's cost is a planning figure for eggs, a pepper, an onion, and a little cheese. Eggs are the price that moves. See the content disclaimer.

Leftovers

Cool the pan, then refrigerate slices within two hours, one hour above 90°F. USDA FSIS lists egg casseroles, quiche, and omelets at three to four days in the refrigerator. The old tip that said three days is in that neighborhood. Reheat to 165°F, the leftover number, or eat the slice cold only if it stayed refrigerated the whole time. A frittata on a buffet table is on the two-hour clock.

Freezer quality for egg dishes is about two months on the FSIS chart. A freezer at 0°F keeps them safe longer than they stay pleasant. Thaw in the refrigerator. Do not freeze a half-baked custard and hope the next bake fixes a warm sit.

Vegetables that are about to turn

A firm pepper with a wrinkled end can be trimmed. A pepper with mold in the seed cavity should be thrown out. Onion that is sprouting can still be used if the bulb is hard and you cut away the green shoot. A soft, wet onion is a discard. This frittata is a good place for a handful of cooked leftover vegetables that were refrigerated properly. It is a bad place for a container you meant to deal with last week. When the container is past the leftover window, trash it. Do not bake doubt into eggs.

Milk allergy, egg allergy, and a smaller pan

Milk in the eggs can be skipped. The texture will be slightly tighter. A milk allergy means skip the cheese too. An egg allergy means this is not your meal. There is no frittata without eggs that is still this recipe.

Eight eggs in a 10-inch pan is a thick cake and needs the full bake. A larger pan makes a thinner cake that finishes sooner. Check the center either way. Cutting into it early spills liquid egg onto the sheet. That liquid is undercooked. Put it back and bake longer. Do not serve the spill as a sauce.

Herbs on top after baking stay brighter. Dried herbs inside the eggs are the list. Fresh parsley is optional and only if it is not slime in the herb box.

Further reading: FDA, "What You Need to Know About Egg Safety"; USDA FSIS egg and leftover chart; Dietary Guidelines for Americans, 2020 to 2025.

Pan size, egg depth, and the moment you stop peeking

Eight eggs in a ten-inch skillet make a thick cake. The edge sets on the stove. The center sets in the oven. If you open the door every three minutes, the heat falls and the center stays wet while the top dries. Set a timer. Check once. A knife slid into the center should come out without liquid egg. A little moisture steaming off is fine. A puddle is not.

If the handle of the skillet is not oven-safe, do not "just be careful." Transfer to a greased pie plate before the oven step, even if the edge has barely set. A melted handle is a ruined pan and a ruined dinner. A pie plate takes a few extra minutes. Plan for that.

Spinach water is the enemy of a set custard

Frozen spinach hides a shocking amount of water. Thaw it, then squeeze it in a clean towel until you think you are done, then squeeze again. The liquid you wring out would have diluted the eggs into a soup that never reaches a firm center. Fresh spinach wilted in the pan should also cook until the water it releases is gone. A shiny puddle under the eggs is a warning.

Pepper and onion should be soft before the eggs go in. Raw onion crunch in a set egg is a texture some people like and many do not. Give the onion the minutes in the method. Garlic for a short minute only. Burnt garlic in eggs tastes louder than burnt garlic in a long soup, because there is less liquid to hide it.

Cheese, herbs, and slicing

Sprinkle the cheese on top, not in a single clump in the middle, or that spot stays gooey while the rest sets. A little cheese is enough to brown. A heavy cap of cheese can look done on top while the egg underneath is not. Look at the egg, not the cheese ad.

Let the pan rest a few minutes before you slice. A hot frittata slumps and the first wedge falls apart. A short rest is not a food-safety problem. A pan left on the counter while you go out for the evening is. Slice, refrigerate the slices you will not eat, and reheat a slice in a covered skillet with a drop of water or eat it cold from the refrigerator if it was chilled promptly.

Leftover roasted vegetables belong here only if they were stored as leftovers should be stored, and only if they are not watery. Pat them dry. A cup of wet roasted zucchini will do what the frozen spinach would have done.

A half batch

Four eggs in a smaller skillet is a reasonable dinner for two. Use a pan the eggs fill to about an inch. A wide pan and four eggs makes a crepe, not a frittata, and it overcooks at the edge. Match the pan to the volume. The herb and the cheese scale down with the eggs. The pepper can stay as a half pepper. The other half, refrigerated, is tomorrow's problem only if you actually eat it.