1 Cook the mushroom filling
Heat olive oil or butter in a large pan over medium-high heat. Add garlic and sauté until the raw smell disappears. Add the mushrooms and cook until soft and lightly caramelised. Season with salt, pepper, chilli flakes, oregano, parsley, and garlic powder. Remove from heat.
2 Prepare the pastry
Lightly dust a clean work surface with flour. Roll out the puff pastry into a rectangle. Using a ramekin, cut out pastry rounds to fit.
3 Assemble the tarts
Line the ramekins with parchment paper. Place the pastry rounds inside. Add a layer of cheddar cheese, followed by the mushroom filling.
4 Bake
Brush the pastry edges with egg wash (or milk). Bake in a preheated oven at 200°C for 30–40 minutes, until golden and puffed.
5 Serve
