01 - Preheat oven to 375°F (190°C).
02 - In a large ovenproof skillet, heat olive oil over medium heat. Add asparagus, zucchini, and scallions. Sauté for 3–4 minutes until slightly tender.
03 - Stir in spinach and peas; cook for 1–2 minutes until spinach is wilted.
04 - In a mixing bowl, whisk together eggs, milk, salt, pepper, and thyme until well combined.
05 - Evenly spread the sautéed vegetables in the skillet. Pour the egg mixture over the vegetables. Gently shake the skillet to distribute evenly.
06 - Scatter crumbled goat cheese evenly across the top of the frittata.
07 - Cook on the stovetop without stirring over low to medium heat for 3–4 minutes, just until the edges begin to set.
08 - Transfer the skillet to the oven and bake for 12–15 minutes, or until the center is set and the top is lightly golden.
09 - Allow the frittata to cool slightly before slicing into wedges. Serve warm or at room temperature.