Savoury Mushroom and Bacon Tart

Name: Savoury Mushroom and Bacon Tart
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Yield: 4
Ingredients: 250 g puff pastry; 25 g butter; 1 tsp oil; 250 g mushrooms; 100 g bacon; 1 clove garlic; 200 ml whipping cream; 3 eggs; 100 g Gruyère cheese; 3 sprigs thyme; nutmeg, as needed; salt and pepper, as needed