Preheat that oven to a toasty 375°F (190°C) because we're about to turn up the heat.
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In a cast-iron skillet heat up that olive oil. Toss in those leeks (or your favorite onion) and let the sizzle begin until they're soft and ready to party.
Introduce the minced garlic to the mix. Let the aromatic magic unfold – garlic is the unsung hero in every recipe.
Time to throw in the spinach, whether it's fresh and lively or frozen and determined. Let it mingle in the skillet until it's all wilted and ready to join the flavor fiesta.
Crack those eggs into a bowl like you're a pro chef. Pour in the half and half (or your chosen dairy/nondairy potion), and whisk it up – we're creating a symphony of flavors here. Pour this golden elixir over the veggie medley in the skillet.
Sprinkle that crumbled feta on top like it's confetti at a culinary celebration. Because, well, it is a celebration.
Slide that skillet into the preheated oven and let it work its magic for about 20-25 minutes or until the eggs are set and the edges are golden brown.
Garnish your masterpiece with fresh dill, and don't forget to season it with salt and pepper. Every dish deserves its moment in the flavor spotlight.