Mushroom Onion Omelet with Cheddar Cheese

By AislePrompt Editorial · Published 2026-04-24 · Updated 2026-04-24

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are developed and reviewed.

A fluffy omelet packed with sautéed mushrooms and onions, topped with melted cheddar cheese, perfect for a hearty breakfast or brunch. This American-inspired brunch recipe, ready in about 20 minutes, combines eggs, mushrooms, onions into a breakfast that fuels the morning without the midday crash — make-ahead-friendly and balanced enough to anchor the first meal of the day. Each serving lands at about 450 calories and feeds 1, so it sits comfortably in a weekly breakfast rotation alongside fruit, yogurt, or coffee. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 10 min Cook: 10 min Serves 1 American cuisine 450 cal/serving

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Ingredients

3 large eggs
1/4 cup, sliced mushrooms
1/4 cup, finely chopped onions
2 tablespoons butter
1/4 cup, shredded cheddar cheese
1/4 teaspoon salt
1/4 teaspoon black pepper
1 tablespoon, chopped fresh chives

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Instructions

Step 1: Whisk together 3 large eggs, 1/4 teaspoon salt, and 1/4 teaspoon black pepper in a bowl until well combined.
Step 2: Melt 1 tablespoon butter in a non-stick skillet over medium heat. Add 1/4 cup sliced mushrooms and 1/4 cup finely chopped onions. Cook 4-5 minutes until softened and onions are golden.
Step 3: Pour egg mixture over vegetables in skillet. Cook 2-3 minutes until bottom sets.
Step 4: Sprinkle 1/4 cup shredded cheddar cheese over top. Fold omelet in half with a spatula.
Step 5: Cook 1-2 minutes more until cheese melts. Garnish with 1 tablespoon chopped chives and serve immediately.