Baked Greek Omelette

1: Set the oven to 375°F and spray a 9x13 pan with cooking spray.

2: Heat the olive oil in a large frying pan. Add the chopped onion, red bell pepper, and 1/2 teaspoon of kosher salt. Cook until softened, about 5 minutes.

3: Add the baby spinach and minced garlic to the frying pan, and toss until wilted, about 3 minutes. Remove from heat and stir in the fresh dill.

4: Transfer the mixture to the baking dish and spread it in an even layer.

5: In a large bowl, combine the eggs, milk, Dijon mustard, remaining 1 teaspoon of salt, and black pepper. Whisk until completely mixed.

6: Pour the egg mixture over the spinach mixture in the baking dish. Sprinkle evenly with crumbled feta cheese.

7: Bake in the preheated oven until the top is light golden-brown and a knife inserted in the middle comes out clean, about 40 to 45 minutes.