01 - Preheat your oven to 375°F.
02 - Combine flour and salt in a mixing bowl. Cut in cold butter until mixture resembles coarse crumbs. Add ice water one tablespoon at a time, mixing until dough holds together. Shape into a disk, wrap, and refrigerate for 20 minutes.
03 - Roll dough on a floured surface to fit a 9-inch tart pan. Press dough into pan and trim excess. Prick base with a fork. Line with parchment paper and fill with pie weights or dry beans.
04 - Bake the weighted crust for 15 minutes. Remove weights and parchment, then bake for an additional 5 minutes. Set aside to cool slightly.
05 - Heat olive oil in a skillet over medium heat. Sauté asparagus and zucchini for 3-4 minutes until just tender. Add spinach, scallions, and peas; cook for 1-2 minutes. Remove from heat and let cool slightly.
06 - Whisk eggs, heavy cream, whole milk, salt, pepper, and nutmeg until fully combined. Stir in half of the grated cheese.
07 - Distribute sautéed vegetables evenly over the pre-baked crust. Pour egg mixture over vegetables. Sprinkle remaining cheese on top.
08 - Bake for 30-35 minutes until filling is completely set and the top is golden brown.
09 - Allow quiche to cool for 10 minutes before slicing and serving warm.