Ingredients:

1 (10 oz) box frozen chopped spinach
8 oz mushrooms
1 clove garlic, minced
1/8 tsp salt
1 Tbsp cooking oil, divided
2 oz feta cheese
4 large eggs
1/4 cup grated Parmesan cheese
1/4 tsp pepper
1 cup milk
1/2 cup shredded mozzarella cheese

Directions:

Preparation:

Preheat your oven to 350ºF (175ºC).
Thaw the frozen spinach and squeeze out as much moisture as possible.
Prepare the Vegetables:

Clean and slice the mushrooms thinly.
Mince the garlic.
Cook the Mushrooms:

Heat a skillet over medium heat and add 1/2 Tbsp of cooking oil.
Add the mushrooms, minced garlic, and salt.
Sauté until the mushrooms have released their moisture and it has completely evaporated. The skillet should be dry.
Assemble the Quiche:

Brush the remaining 1/2 Tbsp of cooking oil inside a 9-inch pie plate.
Evenly layer the cooked mushrooms, thawed spinach, and crumbled feta cheese in the pie plate.
Prepare the Egg Mixture:

In a large mixing bowl, whisk together the eggs, grated Parmesan, pepper, and milk until well combined.
Combine and Bake:

Pour the egg mixture over the layered vegetables and feta in the pie plate.
Sprinkle the shredded mozzarella cheese evenly on top.
Bake:

Place the pie plate in the preheated oven and bake for approximately 50 minutes.
The quiche is done when the top is golden brown and the internal temperature reaches 160ºF (71ºC).
Serve:

Let the quiche cool slightly before slicing.
Serve and enjoy!
Notes:
Make sure to thoroughly drain the spinach to avoid excess moisture in your quiche.
Feel free to add other herbs or spices to suit your taste.
Leftovers can be stored in the refrigerator for up to 3 days and reheated gently.

FAQs:

Can I use fresh spinach instead of frozen?

Yes, you can use fresh spinach. Sauté it first to remove moisture before adding it to the quiche.
How do I know when the quiche is fully cooked?

The top should be golden brown, and the internal temperature should reach 160ºF. The center should be set and not jiggly.
Can I make this quiche ahead of time?

Absolutely! You can prepare and bake the quiche in advance. Store it in the refrigerator and reheat it in the oven before serving.
What can I serve with this quiche?

This quiche pairs well with a fresh green salad, roasted vegetables, or some crusty bread.
Can I freeze leftovers?

Yes, you can freeze slices of the quiche. Wrap them tightly and store them in the freezer for up to 2 months. Reheat in the oven before serving.
Can I add other vegetables or meats?

Definitely! Feel free to add other veggies like bell peppers or onions, or cooked meats like bacon or ham for added flavor.