Caramelized Onion, Red Pepper & Zucchini Frittata

Change it up with this incredible Caramelized Onion, Red Pepper, and Zucchini Frittata. Cheesy, light, and full of rich and vibrant vegetables in every single bite. Perfect for brunch or a quick breakfast for your family. 

The challenge this time around was to find a recipe that uses eggs as the key ingredient. I had an easy time with this one since I’m on a low carb diet and have been eating lots of eggs. I ended up selecting a recipe from Skinny Taste.

My mom introduced me to that blog a couple of months ago, and I’ve tried out a number of Gina’s recipes. They have all turned out great, and this one for Caramelized Onion, Red Pepper and Zucchini Frittata is no exception!

Caramelized Onion, Red Pepper & Zucchini Frittata - A delicious and easy low carb breakfast!

Incredible Caramelized Onion, Red Pepper & Zucchini Frittata

Zucchini is going to be in full swing soon in gardens around the globe. This is a straightforward and tasty way to use up produce in a creative way. Or maybe you don’t garden, pick up some veggies at the grocery store and whip this up. I think if you are a fan of the vegetables used and a fan of eggs, you will swoon over this savory frittata. 

The Best Zucchini Recipes 

Caramelized Onion, Red Pepper & Zucchini Frittata - A delicious and easy low carb breakfast!

Cooking Vegetables Before Blending in Frittata 

Cooking vegetables before mixing in and baking your frittata will help pull out extra water lingering in your veggies. This will help give you that light and moist frittata you want. If you don’t pre-cook vegetables, it could make your frittata watery and not cook up properly. Plus caramelizing the onions gives it a richness you won’t get any other way. 

Do You Add Milk to Frittata 

For this recipe, I do not add milk. The liquid in the vegetables is enough. I find you don’t need milk like other recipes might call for it. Just make sure to whip your eggs well, and then add in your chopped and cooked vegetables. 

Caramelized Onion, Red Pepper & Zucchini Frittata - A delicious and easy low carb breakfast!

Frittata Garnishes and Toppings 

Just like with any other recipe toppings and garnishes can always add even more elements of flavor and add some color to your dish. You could pile on some diced leafy herbs like parsley or basil, or even chives. 

Add a dollop of sour cream, salsa, fresh diced avocado, balsamic vinegar, and more. The sky is the limit on what you can add to your frittata. 

How to Make Caramelized Onion, Red Pepper & Zucchini Frittata

Start by adding some olive oil into your skillet and cook your onions for around 10 minutes. This is going to help caramelize and soften your onions.  

Then toss in your chopped peppers and cook for around five more minutes, and then add in your zucchini and salt and pepper. Cook for approximately three more minutes until it tenderizes some. 

Mix up your egg mixture and cheese, and pour over your cooked vegetables, and cook on stove for three more minutes. Then toss in a preheated oven for 15 minutes. 

Can You Eat Frittata The Next Day 

You can eat leftover frittata the next day. Eat it cold or feel free to reheat it in the microwave. Either way, it is a tasty leftover. I will say frittata always taste best fresh to me, but sometimes the leftover isn’t too bad. 

Just make sure to allow your frittata to cool before you toss it in the fridge for leftovers. 

Best Skillet for Making Frittatas 

One thing I recommend is investing in a skillet that can go from the stove top to oven. You can see most skillets are durable enough to go from stove to oven. But some pans have a rubber lining on the handle that is not oven safe. Make sure before you place your skillet in the oven that it is indeed oven safe. 

Give my zucchini frittata a try today for your next breakfast, dinner, or brunch. Pair with your favorite sides and dive in. This is one savory and incredible recipe that I think you will want to make over and over again. This frittata is a breeze to whip up and requires minimal ingredients. 

What is your favorite flavor for a frittata? 

Caramelized Onion, Red Pepper & Zucchini Frittata - A delicious and easy low carb breakfast!

Yield: 4

Carmelized Onion, Red Pepper & Zucchini Frittata

A delicious and easy low carb breakfast!


  • 1 white onion, chopped
  • 1 red pepper, chopped
  • 2 zucchini, chopped
  • 4 eggs
  • 1/2 cup shredded parmesan cheese
  • salt & pepper, to taste
  • 1 tbsp olive oil


  1. Add olive oil to a skillet and cook your onions for about 10 minutes.
  2. Add the red peppers and cook another 5 minutes.
  3. Add the zucchini and salt & pepper and cook another 3 minutes.
  4. While your veggies are cooking, mix together the eggs and parmesan cheese. Pour the egg mixture on top of the cooked veggies and continue to cook on the stove top for about 3 minutes.
  5. Pre-heat the oven to 400 F and place the skillet in the oven. Bake for 15 minutes.

Stacie Vaughan

Stacie is the mom of two girls and lives in Ontario, Canada. She enjoys cooking/baking, photography, reading, DIY and is fueled by lots of coffee!

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