INGREDIENTS
5 oz
Crimini or button mushrooms
1/4 tsp
Garlic powder
1/4 tsp
Thyme, dried
2
Yellow onions, medium
1
Egg
1 1/2 tbsp
Balsamic vinegar
1
Salt and pepper
1 tbsp
Sugar
2 tbsp
Vegetable oil
1
package Puff pastry, frozen
4 tbsp
Butter, salted
4 oz
Gruyere cheese, grated