Savoury Mushroom Galette

Ingredients

• Shortcrust Pastry

  • 1 1/3 cups (200 g) unbleached all-purpose flour
  • 1/4 tsp salt
  • 1/2 cup (115 g) cold unsalted butter, diced
  • 6 tbsp (90 ml) ice water

• Mushroom Filling

  • 3/4 lb (340 g) mixed mushrooms (such as white, cremini, oyster, shiitake), cut into slices 1/4 inch (5 mm) thick
  • 1/2 tsp thyme leaves
  • 2 tbsp (30 ml) olive oil
  • 2 garlic cloves, chopped
  • 6 cups (140 g) baby spinach
  • 3 tbsp (45 ml) 15% cooking cream or 35% cream, plus more for brushing
  • 1 tbsp (15 ml) whole-grain mustard
  • 1/4 cup (20 g) fresh Parmesan cheese, grated