Melt butter in medium saucepan over medium heat until foaming
Add flour, whisk constantly 2-3 minutes until light golden brown and nutty
Slowly pour in beef broth while whisking constantly (add ½ cup at a time)
Add Worcestershire sauce, soy sauce, onion powder, garlic powder, pepper, thyme, and MSG if using
Whisk well to combine all seasonings
Increase heat to medium-high, bring to gentle simmer, whisking frequently
Reduce heat to low once simmering
Simmer gently 8-10 minutes, whisking every minute, until thickened
Gravy should coat back of spoon—if too thick, add broth 1 tablespoon at a time
If too thin, simmer longer or add cornstarch slurry (1 tsp cornstarch + 2 tbsp cold water)
Taste and adjust seasoning with salt and pepper
Optional: strain through fine-mesh strainer for ultra-smooth texture
Serve immediately while hot