French Onion Flatbread

Ingredients

• 12 oz ball of uncooked pizza dough
• 1 lb (~ 2 medium large) yellow onions
• 1 Tbsp butter, vegan butter, or mild olive oil
• 1-2 sprigs fresh thyme, or scant ¼ tsp dried thyme leaves
• ½ cup beef (or mushroom) stock
• 2 tsp minced garlic (~ 2 cloves)
• 1 tsp dijon mustard
• 1 tsp crème fraîche or full-fat sour cream
• 4 oz aged gruyère cheese
• (optional) pinch of minced parsley to garnish