If you keep a few cans of tuna in the pantry and a carton of eggs in the fridge, you are closer to a real breakfast than you think. This crustless tuna breakfast quiche skips the pastry and the rolling pin, so you go straight from mixing bowl to oven in about fifteen minutes. It bakes into a golden, protein-packed dish that works just as well cold from the fridge on a Tuesday morning as it does warm at a weekend brunch table.
Why You'll Love This Recipe
- No crust to roll, chill, or blind bake, so it comes together in one bowl and one skillet
- High in protein and naturally low in carbs, thanks to tuna, eggs, and cheese
- Easy to make ahead and reheat for busy weekday breakfasts
- Naturally gluten-free, since there is no flour or crust involved
- Flexible with what is already in your fridge, from the cheese to the vegetables
- Just as good served warm, at room temperature, or straight from the fridge
Ingredients You'll Need
Here is what goes into the mixture, along with a few notes on why each ingredient earns its spot.
- Olive oil (2 tbsp): for softening the onion and pepper before they go into the egg mixture.
- Yellow onion (0.5 cup, diced): adds a mild, savory base. Red onion or shallot works too.
- Red bell pepper (0.5 cup, diced): brings color and a little sweetness. Swap in a green pepper or diced mushrooms if you prefer.
- Baby spinach (2 cups, chopped): wilts down into almost nothing but adds color, fiber, and nutrients. Frozen spinach works if you squeeze it very dry first.
- Canned tuna (10 oz, drained and flaked): the star of the dish. Use tuna packed in water for a lighter result, or oil-packed tuna for a richer bite. Drain it well so the quiche does not turn watery.
- Large eggs (6): the base of any crustless quiche. Room temperature eggs blend more smoothly with the milk.
- Whole milk (1 cup): keeps the custard soft. Two percent milk works in a pinch.
- Half-and-half (0.5 cup): adds richness without going as heavy as straight cream. You can use all milk instead if you want a lighter version, or all cream for something more indulgent.
- Shredded cheddar cheese (1 cup): melts through the quiche and helps it set with a nice structure. Swiss, mozzarella, or a Colby jack blend all work well.
- Fresh dill (1 tbsp, chopped, or 1 tsp dried): dill and tuna are a classic pairing, but fresh parsley or chives are good substitutes if dill is not your thing.
- Salt (0.5 tsp) and black pepper (0.25 tsp): season to your taste, keeping in mind that canned tuna and cheese already carry some salt.
If you want to make this dairy-free, leave out the half-and-half and cheese, and use unsweetened plain oat milk instead of regular milk. The texture will be a little softer but still fully cooked and sliceable.
A quick note on tuna: chunk light tuna has a milder flavor and flakes into smaller pieces, while solid white albacore holds together in bigger chunks and tastes slightly richer. Either works here, so pick whichever you already have in the pantry. As for the pan, a standard 9-inch pie dish gives you the classic wedge-shaped slices shown here, but a similarly sized round or square baking dish will work just as well since there is no crust to worry about fitting.
How to Make Crustless Tuna Breakfast Quiche
1. Preheat and prep the dish. Preheat your oven to 375°F. Grease a 9-inch pie dish with butter, oil, or nonstick spray so the finished quiche releases cleanly.2. Sauté the vegetables. Heat the olive oil in a skillet over medium heat. Add the onion and bell pepper and cook for about 4 to 5 minutes, stirring occasionally, until softened. Add the chopped spinach and cook for another minute, just until wilted. Remove the skillet from the heat.
Tips for Best Results
Drain your tuna thoroughly, even pressing it gently with a paper towel, since extra liquid is the most common reason a crustless quiche turns out watery instead of sliceable. Bring your eggs and dairy to room temperature before whisking, since cold eggs can make the bake time less even. Resist the urge to open the oven door in the first 25 minutes, as a sudden temperature drop can cause the center to sink. To check for doneness, give the dish a gentle shake around the 35-minute mark: the edges should be fully set while the very center still has a slight, gentle jiggle, similar to a soft gelatin. It will continue to firm up as it rests, so pulling it a touch early is safer than overbaking, which can make the eggs turn rubbery.
For serving, this quiche pairs well with a simple green salad, sliced avocado, or a piece of toast on the side. It also travels well for meal prep. Slice it into individual portions once fully cooled, and you have grab-and-go breakfasts ready for the week. Each serving comes in at roughly 235 calories, with about 21 grams of protein, 15 grams of fat, 4 grams of carbohydrates, and 1 gram of fiber, making it a solid option if you are watching carbs or trying to get more protein into your morning routine.
If you want to switch things up, try swapping the spinach for chopped broccoli or asparagus, or add a handful of sliced cherry tomatoes on top before baking. Smoked paprika or a pinch of cayenne also adds a nice edge if you like a little heat.
Storage and Reheating
Let the quiche cool completely before storing. Cover it tightly or transfer slices to an airtight container and refrigerate for up to 4 days. To reheat, warm individual slices in the microwave for 45 to 60 seconds, or in a 300°F oven for about 10 minutes if you want to keep the top from getting rubbery.
This quiche also freezes well. Wrap cooled slices individually in plastic wrap, then place them in a freezer bag for up to 2 months. Thaw overnight in the refrigerator before reheating.
Frequently Asked Questions
Can I use fresh tuna instead of canned? Yes. Cook about 10 ounces of fresh tuna until it flakes easily, let it cool, then flake it into the dish the same way you would canned tuna.
Why is my crustless quiche watery? This usually comes down to too much liquid in the mix, whether from undrained tuna, unsqueezed spinach, or vegetables that released water while baking. Draining and patting your ingredients dry solves most of the problem.
Can I make this in a muffin tin instead of a pie dish? Yes. Divide the mixture between 10 to 12 greased muffin cups and bake at 375°F for about 18 to 22 minutes, until set and lightly golden.
Is this recipe keto-friendly? With around 4 grams of carbohydrates per serving, this quiche fits comfortably into most keto and low-carb eating plans.
Can I make it ahead for the week? Absolutely. Bake it the night before or on a weekend, then refrigerate and reheat individual slices for quick breakfasts throughout the week.
Can I use a dairy-free half-and-half instead of the regular kind? Yes, a dairy-free half-and-half alternative or full-fat canned coconut milk will both work, though coconut milk will add a faint coconut flavor that some people enjoy with tuna and others prefer to avoid.
What can I use instead of cheddar cheese? Swiss cheese is a classic pairing with tuna, and a mild mozzarella or Monterey Jack will also melt smoothly and let the tuna and dill flavors come through more clearly.
The printable recipe card, with adjustable servings and exact measurements, is below.
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