This veggie egg bake makes six clean slices from 8 large eggs, 1 cup dairy or unsweetened plant milk, and 2 cups cooked vegetables. Bake it in a greased 9-inch square pan at 375°F for 30 to 40 minutes.
Cook and drain watery vegetables before mixing them with the eggs. The vegetarian egg bake is ready when the surface looks dry and the center barely jiggles, not when it turns deeply browned.
Veggie Egg Bake: Ratio and Vegetable Choices
8 Eggs with 1 Cup Dairy or Unsweetened Plant Milk
Use an 8:1 ratio of large eggs to dairy: 8 large eggs and 1 cup milk. This gives the casserole enough moisture for a tender texture without making the center loose or watery.
- 8 large eggs
- 1 cup whole milk, half-and-half, or unsweetened plain plant milk
- 1 teaspoon kosher salt, divided
- 1/2 teaspoon black pepper
- 1/2 teaspoon garlic powder, optional
- 1 tablespoon olive oil
- 1/2 cup shredded cheddar, crumbled feta, or dairy-free cheese, optional
For a dairy-free version, use unsweetened, unflavored plant milk. Avoid sweetened milk or flavored varieties, which can affect the casserole’s taste. The plant milk may produce a slightly lighter set, but the same egg ratio works well.
2 Cups Cooked Vegetables
Start with about 4 1/2 cups raw vegetables, then cook and drain them until you have 2 cups. A balanced combination includes:
- 1 cup sliced mushrooms
- 1 cup small broccoli florets
- 1/2 cup diced red bell pepper
- 2 packed cups baby spinach
You can replace these with zucchini, onions, kale, asparagus, or leftover roasted vegetables. Keep the final amount at 2 cups cooked vegetables. Excess vegetables can prevent the eggs from binding into neat slices.
Vegetarian Egg Bake: Cook and Drain the Vegetables
Sauté Watery Vegetables Until Dry
Heat the olive oil in a large skillet over medium-high heat. Add the mushrooms, broccoli, and bell pepper. Sprinkle with 1/2 teaspoon of the salt, then cook for 5 to 7 minutes, stirring often.
The mushrooms should shrink, the broccoli should become bright green, and any liquid in the skillet should evaporate. Add the spinach and cook for 1 to 2 minutes, just until wilted.
Do not stop while the vegetables still sit in liquid. Moisture released during baking can make an egg and vegetable casserole weep around the edges or remain soft in the middle.
Cool the Vegetables Before Mixing
Transfer the cooked vegetables to a fine-mesh strainer or a plate lined with paper towels. Press gently to remove excess liquid, especially if you used zucchini, mushrooms, frozen spinach, or other high-moisture vegetables.
Measure 2 cups of the cooked, drained vegetables. Spread them out for several minutes so they cool slightly. Hot vegetables can begin cooking the egg mixture before the pan reaches the oven, which may create uneven curds.
Assemble the Egg and Vegetable Casserole
Grease a 9-Inch Square Pan
Heat the oven to 375°F. Coat a 9-inch square baking pan with oil or nonstick spray, including the corners. For easier serving, line the bottom with parchment after greasing it, leaving two sides overhanging.
A 9-inch square pan gives the bake enough depth for a soft, sliceable center. A larger pan will make a thinner casserole that finishes sooner, while a smaller pan may require more baking time.
Layer, Pour, and Season
In a large bowl, whisk the eggs, milk, remaining 1/2 teaspoon salt, black pepper, and garlic powder until the yolks and whites are fully blended. Do not whip in lots of air; a smooth mixture gives the finished bake a more even texture.
Spread the cooled vegetables across the prepared pan. Sprinkle the optional cheese evenly over them. Pour the egg mixture slowly across the surface, then gently shake the pan so the liquid settles around the vegetables.
Use a spatula to distribute any vegetables that float into one area. The filling should form an even layer with no large dry patches. If using feta or another salty cheese, reduce the added salt slightly.
Bake, Rest, and Slice the Egg-and-Vegetable Casserole
Bake at 375°F for 30–40 Minutes
Place the pan on the center oven rack. Bake for 30 to 40 minutes, rotating the pan once after about 20 minutes if your oven cooks unevenly.
Begin checking at 30 minutes. A shallow metal pan may finish near the lower end of the range, while a glass or ceramic pan may need closer to 40 minutes. If the edges are set but the center still moves in a wave, continue baking for 5 minutes at a time.
Avoid baking until the top is deeply browned. Overbaking drives out moisture and can make the eggs rubbery, particularly around the edges.
Look for a Barely Jiggly, Dry Center
The egg vegetable casserole is done when the edges are firm, the top looks dry, and the center gives a slight jiggle when you gently move the pan. The center should not look wet or ripple like uncooked liquid.
For a temperature check, insert an instant-read thermometer into the center without touching the pan. It should register about 160°F. The eggs will continue to firm as the casserole rests.
Rest 10 Minutes and Slice 6 Servings
Set the baked casserole on a cooling rack and rest it for 10 minutes. This pause lets the egg proteins finish setting and allows the juices to redistribute, making cleaner cuts.
Run a thin knife around the edges, then cut the bake into 6 squares. Lift each portion with a wide spatula. The finished slices should hold their shape while remaining tender, with vegetables distributed throughout rather than pooled beneath the eggs.
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