Step 1

Set oven to 375 degrees.

Step 2

Heat oil in 8 or 9 inch cast iron pan (or other stove & oven safe pan).

Step 3

Add leeks (or onions) and cook until they start to soften, about 2 minutes.

Step 4

If using mushrooms, add them in next and cook for another 2 minutes.

Step 5

Add in remaining veggies, salt, and pepper. Cook for 1-2 more minutes.

Step 6

Add in Just Eggs and fresh herbs. Stir to combine and even out veggies.

Step 7

Sprinkle parmesan on top.

Step 8

Using oven mitt, transfer pan into oven.

Step 9

Bake for 13-16 minutes (ovens vary), until liquid has mostly solidified. Test with fork. It's okay if there is a little liquid as it will continue to cook after it comes out.

Step 10

Take out and let frittata sit for 10 minutes before cutting, garnishing, and enjoying.