Air Fryer Breakfast Casserole (Easy 20-Minute Egg Bake)

This air fryer breakfast casserole is the fastest way I know to put a hot, protein-packed breakfast on the table — fluffy eggs, savory sausage, and melty cheddar, all done in about 20 minutes. It’s keto-friendly, endlessly customizable, and bakes up in individual ramekins so everyone gets their own.

Quick answer: Whisk eggs and cream with cooked sausage, tomatoes and green chilies, Italian seasoning, and cheddar. Divide into ramekins, top with extra cheese, and air fry at 340°F for 5–8 minutes until the centers are set and the tops are bubbly

I’ve been making these ramekin egg bakes for years on busy mornings, and they’ve quietly become the recipe I reach for most when I want something hot, filling, and fast. If you love a hands-off egg breakfast, it sits right alongside my Ninja Crispi sausage and egg casserole — another keto-friendly egg bake — in my regular rotation.

Why You’ll Love This Air Fryer Egg Bake

• Ready in 20 minutes — faster than the oven, with no big appliance to preheat.
• Perfectly cooked eggs every time. The air fryer’s circulating heat sets the centers without drying the edges.
• Individual portions mean no slicing, easy cleanup, and built-in portion control.
• Naturally keto and low-carb — about 4g net carbs per serving, no crust required.
• Made for meal prep. Assemble the night before, or cook a batch and reheat all week.
• Infinitely customizable with whatever protein, cheese, and veggies you have on hand.

For a fluffier, bread-based take on the same idea, you can also try my crescent roll breakfast casserole — but if you’re keeping it low-carb, the ramekin version below is the one.

Ingredients You’ll Need

You only need a handful of basic ingredients, and almost every one is swappable. Full measurements are in the printable recipe card.

• Eggs — Four large eggs give the bake its fluffy structure. Use whole eggs for the richest result, or egg whites for a lighter version.
• Heavy cream — Just two tablespoons makes the eggs creamy and custardy. Whole milk, half-and-half, or unsweetened almond milk all work.
• Italian sausage (cooked) — Adds savory, lightly spiced flavor. Brown and drain it first. Breakfast sausage, bacon, ham, or turkey sausage all substitute well.
• Diced tomatoes and green chilies — One can (like Rotel) brings a juicy, mildly spicy lift. Drain well so the casserole doesn’t turn watery.
• Cheddar cheese — Shredded, for that gooey, golden top. Monterey Jack, Swiss, or a Mexican blend are all great swaps.
• Italian seasoning — Ties the savory flavors together. Add a pinch of salt and pepper to taste.

How to Make Air Fryer Breakfast Casserole

This comes together in five quick steps.

Step 1: Mix the savory base

In a large bowl, stir together the cooked sausage, drained diced tomatoes and green chilies, and Italian seasoning until evenly combined. Fold in most of the shredded cheddar, saving a little to top each ramekin.

Step 2: Whisk in eggs and cream

Crack in the eggs, pour in the heavy cream, and whisk until the mixture is slightly frothy. That bit of air is what gives the finished bake its light texture.

Step 3: Fill the ramekins

Lightly grease your ramekins (or line your basket with a silicone mold or parchment). Divide the mixture evenly, then sprinkle the reserved cheese over each one.

Step 4: Air fry

Place the ramekins in the basket and cook at 340°F for 5–8 minutes. Air fryers vary, so start checking at 5 minutes — you want the centers fully set and the cheese melted and bubbly.

Step 5: Rest and serve

Carefully remove the ramekins (they’ll be hot), let them rest 2–3 minutes so the eggs finish setting, then dig in.

Tips for the Best Air Fryer Egg Casserole

• Always pre-cook your meat and watery veggies. Raw sausage won’t finish in time, and uncooked vegetables release water that makes the eggs soggy.
• Drain everything well. Excess liquid from canned tomatoes or thawed veggies is the #1 cause of a watery casserole.
• Don’t overfill the ramekins. Leave about a half-inch at the top — the eggs puff as they cook.
• Tent with foil if the tops brown too fast. This lets the centers catch up without overcooking the surface.
• Let them rest before serving so the custard sets and the flavors settle.

Easy Variations

• Keto / low-carb: Skip the tomatoes, use almond milk instead of cream, and add mushrooms, spinach, or bell pepper.
• Vegetarian: Drop the sausage and load up on sautéed peppers, onions, and spinach.
• Tex-Mex: Layer in a spoonful of salsa and top with a Mexican cheese blend; finish with avocado.
• Loaded / hearty: Add a layer of cooked hash browns before the egg mixture — my air fryer breakfast potatoes work perfectly here for a brunch-worthy version.
• Meat swaps: Bacon, diced ham, chorizo, or turkey sausage all work beautifully.

How to Store, Freeze, and Reheat

• Refrigerate: Store cooled casseroles in an airtight container for up to 3 days.
• Freeze: Wrap individually and freeze for up to 2 months. Thaw overnight in the fridge before reheating.
• Reheat: Pop them back in the air fryer at 320°F for 2–3 minutes until heated through, or microwave for about 60 seconds.
• Make ahead: Assemble the mixture the night before, cover, and refrigerate. Cook fresh in the morning (you may need an extra minute).

What to Serve With It

These egg bakes are a meal on their own, but they round out beautifully into a bigger spread. I love serving them with crispy air fryer breakfast potatoes on the side, or pairing them with something sweet like air fryer cinnamon roll French toast when I’m feeding a crowd. For a grab-and-go morning, a batch of air fryer chocolate chip granola over yogurt makes an easy companion.

More Air Fryer Breakfast Ideas

If this becomes a regular in your house, you’ll probably want a few more easy mornings on hand. My everything bagel breakfast pockets and classic breakfast grilled cheese are two of the fastest, while the French toast breakfast tacos and apple cheddar bacon scones feel a little more special for slow weekends. Craving something savory and handheld? The barnyard buster wrap is a reader favorite.

Frequently Asked Questions

Why is my air fryer breakfast casserole watery? Usually too much liquid. Drain canned tomatoes and any thawed vegetables thoroughly, pre-cook watery veggies and meat, and don’t add extra cream beyond what the recipe calls for.

What size ramekins should I use? Both 6-ounce and 8-ounce ramekins work. With 8-ounce ramekins your portions are deeper, so add 1–2 minutes of cook time and check the centers.

Can I make this ahead of time? Yes. Mix everything the night before, cover, and refrigerate. Cook it fresh in the morning, adding a minute or two if the mixture is cold.

Can I make one large casserole instead of individual servings? Absolutely. Pour the mixture into one oven-safe dish that fits your basket and increase the cook time, checking the center for doneness — a larger bake takes noticeably longer than individual ramekins.

Can I make it without eggs? Yes — a liquid egg substitute or a seasoned tofu scramble both work for an egg-free version.

Can I use frozen vegetables or pre-cooked meat? You can. Fully thaw and drain frozen veggies first, and make sure pre-cooked meat is warmed and not releasing liquid.

How do I keep the top from overcooking? If the cheese is browning before the center sets, loosely tent the ramekins with foil for the last few minutes.