Sauté mushrooms until browned. Make sure your pan is properly heated before adding ingredients — you should hear a nice sizzle. Don't overcrowd the pan or things will steam instead of getting that beautiful golden color.
Add onion and cook until soft.
Add garlic and cook 1 minute.
Sprinkle with flour, stir.
Gradually add broth, stirring constantly.
Simmer until thickened. Keep an eye on the heat — you want a gentle simmer with small bubbles, not a rolling boil. This helps develop flavor without overcooking.
Remove from heat, stir in sour cream and mustard.
Add paprika, salt, and pepper. Always taste as you go — you can add more seasoning, but you can't take it away!
Serve over noodles, garnish with parsley. This is your chance to make it look as good as it tastes! A little garnish goes a long way for presentation.