Every Helping
Sign in

Breakfast recipe · from the recipe book

Spinach, Mushroom and Feta Breakfast Casserole

Garlicky mushrooms, spinach and tender potatoes set in a tangy yogurt-egg custard with a crisp, buttery oat-parmesan crumb on top.

Spinach, Mushroom and Feta Breakfast Casserole

Ingredients

  • 2½ small450 gRed potatoescut into 1/2-inch cubes
  • 4 cups sliced280 gWhite mushroomssliced
  • 5 cups loosely packed150 gBaby spinach
  • 1 medium110 gYellow oniondiced
  • 3 cloves9 gGarlicminced
  • 1½ tbsp20 gOlive oil
  • 6 large300 gEggs
  • 9 oz250 gPlain Greek yogurt, nonfat
  • ½ cup crumbled80 gFeta cheesecrumbled
  • 1 cup sprigs8 gFresh dillchopped
  • ¼ tsp2 gSalt
  • ½ tsp1 gBlack pepper
  • ⅔ cup50 gOld-fashioned rolled oats
  • 3 tbsp grated20 gGrated Parmesan
  • 1½ tbsp20 gUnsalted buttermelted

Steps

  1. Preheat the oven to 375°F (190°C) and grease an 8x8-inch baking dish with a little of the olive oil.
  2. Boil the potato in a pot of water for 8 minutes until just tender, then drain.
  3. Heat the remaining olive oil in a large skillet over medium-high heat. Cook the onion and mushrooms for 7 minutes until browned, add the garlic for 1 minute, then stir in the spinach until wilted.
  4. Spread the potato and the mushroom-spinach mixture in the baking dish.
  5. Make the yogurt sauce: whisk the egg, greek yogurt, dill, salt and black pepper until smooth, then pour it over the vegetables and scatter the feta on top.
  6. Make the oat crumb: stir the oats, parmesan and melted butter together and sprinkle evenly over the casserole.
  7. Bake 35 to 40 minutes until the center is set, the topping is golden and the custard reaches 160°F (71°C).
  8. Rest 10 minutes before cutting into 4 portions.

Check labels: Gluten-free when you buy old-fashioned rolled oats labeled gluten-free.

Contains: Milk, Egg. Some brands contain gluten.

Cook mode Log it in Today

Made it

Made it? Share how yours turned out.

Saved in the Every Helping recipe book on October 24, 2026.

Want one that fits your numbers?

Pick the meal, the pan and your targets, and the Every Helping recipe generator writes a recipe with every number worked out. Free on the web.

Make a recipeMore from the recipe book