Here's a step-by-step guide to making Homemade Frittata with Mushrooms:

1. Preheat your oven to 350°F (175°C).
2. In a large mixing bowl, whisk together 8 large eggs and 1/4 cup of milk until well combined. Season with salt and pepper to taste. Set aside.
3. Heat 1 tablespoon of olive oil in a large oven-safe skillet over medium heat.
4. Add 8 ounces of sliced mushrooms to the skillet and cook, stirring occasionally, until they are golden brown and tender, about 5-7 minutes.
5. Add 1 small diced onion and 2 cloves of minced garlic to the skillet with the mushrooms. Cook for an additional 2-3 minutes until the onion is translucent and fragrant.
6. Stir in the chopped broccoli florets, frozen green peas, and cooked chopped bacon. Cook for another 2-3 minutes until the broccoli is slightly tender.
7. Pour the egg mixture evenly over the vegetable and bacon mixture in the skillet. Gently stir to distribute the ingredients evenly.
8. Cook the frittata on the stovetop for 3-4 minutes, until the edges start to set.
9. Sprinkle 1/2 cup of crumbled feta cheese evenly over the top of the frittata.
10. Transfer the skillet to the preheated oven and bake for 12-15 minutes, or until the frittata is set in the center and the top is golden brown.
11. Remove the skillet from the oven and let the frittata cool for a few minutes before slicing.
12. Garnish with fresh herbs, if desired, and serve the Homemade Frittata with Mushrooms, Broccoli, Peas, Bacon, and Feta warm or at room temperature.

That's it! With these simple steps, you'll have a delicious and nutritious Homemade Frittata with Mushrooms ready to enjoy with your family or friends.