Spinach and Mushroom Quiche

This Spinach and Mushroom Quiche is a delightful combination of savory mushrooms, tender spinach, and creamy Gruyère cheese, all baked to perfection in a rich, custard-like filling. It's perfect for brunch, lunch, or a light dinner.

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Name: Spinach and Mushroom Quiche
Prep time: 20 min
Cook time: 45 min
Total time: 65 min
Ingredients: 2 tablespoons olive oil (extra-virgin ); 8 oz sliced fresh mixed wild mushrooms such as cremini (shiitake, button, and/or oyster mushrooms); 1 1/2 cups sweet onion (thinly sliced); 1 tbsp garlic (thinly sliced); 5 oz baby spinach (fresh (about 8 cups, coarsely chopped)); 6 large eggs; 1/4 cup whole milk; 1/4 cup half-and-half; 1 tbsp Dijon mustard; 1 tbsp fresh thyme leaves (plus more for garnish); 1/4 tsp salt; 1/4 tsp ground pepper; 1 1/2 cups shredded Gruyère cheese