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Export 11 ingredients for grocery delivery
Preheat oven to 350°F | 180°C. Lightly spray a 12-cup capacity muffin tin with nonstick oil spray.
In a large bowl, whisk together eggs and onion. Season with salt and pepper, to taste.
Add egg mixture halfway up into each tin of a greased muffin tin.
Divide the three topping combinations into 4 muffin cups each.
Bake for 20 minutes.
Serve OR store in an airtight container in the refrigerator for up to 4 days and reheat when ready to serve.