I start by heating olive oil in a cast-iron skillet over medium heat. Once hot, I add the thinly sliced potatoes with a pinch of salt. Cooking them evenly until golden and tender takes about 6 minutes, and this step ensures every bite has a crispy texture.
Next, I sauté the fennel until it starts caramelizing, then add the scallions and spinach. Covering the pan for a few seconds lets the spinach wilt perfectly without overcooking. Each layer of vegetables brings depth and color to the frittata.
While the veggies cook, I bring a small saucepan of water to a boil and blanch the peas for 2 minutes. Cooling them in ice water keeps their vibrant green color and sweet flavor intact. This step is small but makes a huge difference in presentation and taste.
After all vegetables are ready, I return the golden potatoes and peas to the skillet. I whisk eggs with milk and a teaspoon of salt until smooth, then pour the mixture over the veggies. Letting it sit on low heat for a minute helps the edges start setting before going into the oven.
I crumble goat cheese evenly over the top, then transfer the skillet to a preheated 375°F oven. Baking for 10-12 minutes ensures the eggs are just set and the top is slightly golden. Once done, I sprinkle minced chives and freshly cracked pepper for a finishing touch