01 - Preheat oven to 375°F.
02 - In a bowl, mix flour and salt. 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 out 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 and fill with pie weights or dry beans.
04 - Bake crust for 15 minutes. Remove weights and parchment; bake 5 more minutes until lightly golden. Set aside.
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 until spinach wilts. Remove from heat and let cool slightly.
06 - In a bowl, whisk eggs, heavy cream, whole milk, salt, pepper, and nutmeg until fully combined. Stir in half the grated cheese.
07 - Spread sautéed vegetables evenly over the blind-baked crust. Pour egg mixture on top. Sprinkle with remaining cheese.
08 - Bake for 30-35 minutes, or until filling is set and top is golden brown. A knife inserted in the center should come out clean.
09 - Let quiche cool for 10 minutes before slicing and serving. Serve warm or at room temperature.