01 - Heat the oven to 375°F.
02 - Place the pie crust in a 9-inch tart pan, prick the base with a fork, line with parchment paper, and fill with pie weights or dried beans. Blind bake for 10 minutes, then remove weights and bake for an additional 5 minutes. Set aside.
03 - Warm olive oil in a skillet over medium heat. Sauté diced onion and bell pepper for 3 minutes until softened. Add zucchini and cook for 4 more minutes. Stir in spinach and cook until wilted, about 1 minute. Remove from heat and allow to cool slightly.
04 - In a large bowl, whisk together eggs, whole milk, heavy cream, salt, pepper, and ground nutmeg until fully combined.
05 - Evenly spread the sautéed vegetables over the pre-baked crust. Scatter halved cherry tomatoes and grated cheese on top.
06 - Pour the egg mixture evenly over the vegetables and cheese in the crust.
07 - Bake in the preheated oven for 30 to 35 minutes, or until the filling is set and the surface is golden brown.
08 - Allow the quiche to cool for 10 minutes before slicing and serving.