how long do you cook a frozen quiche
1 Place the foil around the edges of the crust to prevent burning. 2  Place the frozen quiche in the oven and bake for about 1 hour, or until the filling is set and the crust is golden brown. 3  To cook the quiche immediately (without freezing first), preheat the oven to 350 degrees and bake for 45 minutes to 1 hour. Place the foil around the edges of the crust to prevent burning. 2  Place the frozen quiche in the oven and bake for about 1 hour, or until the filling is set and the crust is golden brown. 3  To cook the quiche immediately (without freezing first), preheat the oven to 350 degrees and bake for 45 minutes to 1 hour.