Preheat the oven to 350 degrees. Place the pastry in a 9-inch tart pan with a removable bottom. Use a fork to generously prick the bottom and fill with pie weights. Bake 12 minutes. Remove the pie weights and bake an additional 6 minutes. Cool completely on a wire rack.
Increase the oven temperature to 375 degrees. In a large skillet, heat the oil over medium heat. Add the garlic, onions and mushrooms. Cook 8 minutes, stirring frequently.
Meanwhile, combine the cheese, eggs, half-and-half, salt and pepper in a medium bowl. Add the mushroom mixture and blend well. Pour into the prepared crust. Bake 25 to 30 minutes or until the tart is set. Cool on a wire rack at least 5 minutes before slicing and serving.
Author:
Recipe by The Tennessee Magazine at https://www.tnmagazine.org/fascinating-fungi/