
👨🍳 Chefy Tip: Cook the filling until the mushrooms stop releasing liquid and the bottom of the pan has a fond — that's five minutes, not two. Score the pastry border deeply enough to hold the filling. Brush the edge with egg wash twice — once before the filling goes on, once right before baking.
Preheat oven to 375°F (190°C). Sauté spring onions, mushrooms, and garlic in olive oil with thyme, salt, and pepper until softened, about 5 minutes.
Roll out puff pastry on a parchment-lined baking sheet. Score a 1-inch border. Spread mushroom mixture over center and top with goat cheese. Brush edges with egg wash.
Bake 25-30 minutes until pastry is golden and crisp. Cool slightly before slicing.
Spring onions are rich in antioxidants and vitamin C, which support immune health. Mushrooms provide umami depth and essential nutrients like selenium and B vitamins, making this tart both delicious and nutritious.