Wash the mushrooms, then drain and dry with paper towels. Cut in halves or thick slices.Grill them in a frying non-stick pan without oil or salt. Take out in a large bowl.
Finely slice the bell pepper half and the chicken breast. Add them to the bowl. Mix gently.
Prebaking the crust
Lay the crust in the pie/ quiche pan, gently press the crust against the pan's walls and bottom, then trim the excess crust that exceeds the pan walls.
Use a fork to puncture the crust here-and-there to allow a proper baking.
If you have pie weights, now it's the moment to set them on a parchment paper on top of the crust so that the dough doesn't shrink or bubble up while baking. I didn't have any, so I prebaked my crust without them and the result can be seen in the picture - the crust shrunk a little. But turned out OK as well. Sometimes I use beans as an alternative, but this time I didn't have any of those either :)
Bake for 10-12 minutes in a preheated oven at 200°C.
Adding the filling
Take out the pan from the oven and leave to cool down for about 5 minutes.
Mix the heavy cream and the sour cream with the eggs in a bowl, add the finely sliced spring onion. Season with salt only if needed, as the white cheese and the chicken breast are already salty.
Add the chopped ingredients on top of the pie crust, sprinkle the white cheese, then use a ladle to carefully add the sour cream-eggs mix on top. Gently add the liquid composition so that the whole crust is covered.
Bake for 35-40 minutes at 190°C, then leave to rest for 40-60 minutes before serving.
Enjoy with a fresh tomato salad or as it is. Cheers!
Notes
About 50g of crust get discarded when you trim the edges, so calories count excludes them here.