This low carb 3-ingredient onion egg bake is the kind of thrifty comfort food my nana leaned on when the pantry was nearly bare but everyone still needed a warm, satisfying meal. It’s essentially a crustless, flourless onion “pie” or thick frittata: just slowly caramelized onions, plenty of eggs, and a touch of salt to coax out all the flavor. Baked in a simple glass dish, it puffs up into a fluffy, pale yellow slab threaded with deeply browned onion ribbons and a soft, golden crust. It’s practical, budget-friendly, and surprisingly luxurious for something so simple.
Serve this onion egg bake warm, cut into thick squares, with a crisp green salad dressed in a sharp vinaigrette to balance the richness. It also pairs well with sliced tomatoes or cucumber, a spoonful of tangy yogurt or sour cream, or a side of sautéed greens. For brunch, offer it alongside fresh fruit and coffee; for a light dinner, add roasted vegetables or a simple broth-based soup. Leftover squares are excellent at room temperature, tucked into a lunchbox with raw veggies or pickles for contrast.
3-Ingredient Onion Egg Bake
Servings: 4
Ingredients
2 tablespoons neutral oil or butter (for greasing the dish and cooking the onions)
2 large yellow onions, thinly sliced
8 large eggs
1 teaspoon fine salt, plus more to taste
Directions
Preheat your oven to 350°F (175°C). Lightly grease an 8×8-inch (or similar) glass baking dish with a little of the oil or butter, making sure to coat the bottom and sides so the bake releases easily.
Heat the remaining oil or butter in a large skillet over medium heat. Add the thinly sliced onions and the salt, stirring to coat the onions evenly in the fat.
Cook the onions slowly, stirring every few minutes, until they are very soft, golden, and deeply caramelized in spots, 20–30 minutes. Adjust the heat as needed so they brown gradually without burning; the goal is sweet, tender onions with dark ribbons running through.
While the onions cook, crack the eggs into a large bowl. Whisk vigorously until the yolks and whites are fully blended and slightly frothy; this helps the bake turn out fluffy and light.
Taste the caramelized onions and adjust the salt if needed. Let them cool for 3–5 minutes so they don’t scramble the eggs on contact.
Stir the warm onions into the beaten eggs, distributing them evenly so every bite will have some of those caramelized strands.
Pour the onion-egg mixture into the prepared glass baking dish, smoothing the top with a spatula. You should see ribbons of onion marbled through the pale yellow base.
Bake in the preheated oven for 25–35 minutes, or until the egg bake is puffed, set in the center, and the top is a soft golden color with some deeper brown onion bits visible. A knife inserted in the middle should come out mostly clean, without runny egg.
Remove the dish from the oven and let it rest for at least 5–10 minutes. The bake will deflate slightly as it settles, becoming tender and sliceable.
Cut into thick squares and serve warm, enjoying the fluffy, custardy texture and the sweet, savory flavor of the caramelized onions.
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