- In a large skillet, melt butter over medium heat. Add diced onion and cook until translucent, about 5 minutes. 
- Add garlic and mushrooms. Sauté for another 3–4 minutes until mushrooms begin to soften. 
- Stir in canned deer meat and Worcestershire sauce. Cook for 2–3 minutes, just to warm through. 
- Pour in broth. If using flour to thicken, whisk it into the broth before adding. Simmer for 5–7 minutes. 
- Stir in sour cream. Cook gently over low heat, do not boil once sour cream is added. 
- Season with salt and pepper to taste. 
- Serve over hot egg noodles and garnish with fresh parsley if desired.