Baked Zucchini Spinach Feta Casserole (Printable)

Wholesome Mediterranean casserole with tender zucchini, fresh spinach, and tangy feta baked until golden.

# What You Need:

→ Vegetables

01 - 2 medium zucchinis, sliced into 1/4-inch rounds
02 - 5 oz fresh baby spinach
03 - 1 small onion, finely chopped
04 - 2 garlic cloves, minced

→ Dairy & Eggs

05 - 6 oz feta cheese, crumbled
06 - 1 cup grated mozzarella cheese
07 - 4 large eggs
08 - 3/4 cup milk (whole or 2%)

→ Pantry & Seasonings

09 - 2 tbsp extra virgin olive oil
10 - 1/2 tsp dried oregano
11 - 1/4 tsp ground black pepper
12 - 1/4 tsp salt (adjust to taste)
13 - 1/4 tsp crushed red pepper flakes (optional)

→ For Greasing

14 - 1 tbsp butter or additional olive oil

# Steps:

01 - Preheat oven to 375°F. Grease a 9x9-inch baking dish with butter or olive oil.
02 - Heat 1 tbsp olive oil in a large skillet over medium heat. Add chopped onion and sauté for 3 minutes until translucent. Add garlic and cook for 1 minute.
03 - Add spinach and cook, stirring, until wilted (about 2 minutes). Remove from heat and let cool slightly.
04 - In a large bowl, whisk together eggs, milk, oregano, black pepper, and salt.
05 - Arrange half of the zucchini slices in the prepared baking dish. Spread half of the spinach mixture over the zucchini, then sprinkle with half the feta and mozzarella.
06 - Repeat the layers with remaining zucchini, spinach, feta, and mozzarella.
07 - Pour the egg mixture evenly over the layered vegetables and cheese. Drizzle with remaining olive oil and sprinkle with red pepper flakes, if using.
08 - Bake uncovered for 35 minutes, or until the casserole is set and the top is golden brown.
09 - Let rest for 10 minutes before slicing and serving.

# Expert Advice:

01 -
  • The custardy egg mixture binds everything together like a Mediterranean strata that feels fancy enough for guests
  • It uses up summer vegetables in the most delicious way possible
02 -
  • Squeezing excess moisture from the cooked spinach prevents a watery casserole
  • Letting the dish rest before cutting is the difference between neat slices and a messy spoonful
03 -
  • Pat the zucchini slices dry with paper towels before layering to avoid excess moisture
  • Let the casserole cool for the full 10 minutes, it makes serving so much cleaner