Preheat the oven to 200º C degrees
Cook mushrooms, onion and garlic until mushrooms are slightly browned (10 min)
Remove from heat
Stir nutmeg, creams, cheese, salt and pepper into mushroom mix
Reserve sauce
Sprinkle the paprika over the chicken
Fry or grill chicken until just golden
Transfer to baking dish
Pour over Mushroom mix from above
Bake for 15 minutes.
Serve immediately