Preheat oven to 175°C (347°F) with convection setting.
Peel and finely dice the onions. Clean the mushrooms and slice them. Wash the chicken fillets, pat dry thoroughly, and wrap each one with 2 slices of bacon.
Heat 1 tablespoon of oil in a large pan over medium-high heat. Fry the wrapped fillets on all sides for 3-4 minutes until browned. Season with pepper and remove from the pan.
Add 3 tablespoons of oil to the same pan over medium-high heat. Fry the mushroom slices for 3-4 minutes, stirring occasionally. Add the diced onions and fry for 2 minutes. Season with salt and pepper.
Sprinkle 2 tablespoons of flour over the mushroom mixture and stir for 1 minute. Pour in 400 ml of water, 200 g whipped cream, and 2 teaspoons instant chicken broth. Stir well and bring to a boil over medium-high heat, then reduce heat to medium-low and simmer for 5 minutes. Season with salt, pepper, and paprika powder to taste.
Lightly oil a baking dish. Place the wrapped fillets in the dish and pour the mushroom cream sauce around them. Grate the mountain cheese and sprinkle evenly over the top.
Bake for 20-25 minutes until the cheese is golden brown. While baking, wash and roughly chop the parsley.
Arrange on a serving plate and sprinkle the parsley over the top.
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