Mushroom Spinach Phyllo Cups

• 2 oz Gruyère cheese, cut into pieces

Phyllo Cups

• 4 oz unsalted butter, diced (1 in.)
• 5 sheets phyllo dough

Filling

• 4 oz yellow onions, cut into pieces
• 3 oz bacon, cut into pieces
  hoặc 3 oz pancetta
• 1 garlic clove
• ½ oz olive oil
• 8 oz cremini mushrooms, stems removed
• 1 sprig fresh thyme leaves
  hoặc 1 sprig fresh rosemary leaves
• ½ tsp salt, to taste
• 2 oz baby spinach