In a sauté pan or skillet, heat the butter or olive oil over medium high heat. Add the mushrooms and cook for 4 to 5 minutes, until they are starting to brown on the bottom.
Flip and cook another 3 minutes without stirring.
Reduce the heat to low, add the onion powder, smoked paprika, Worcestershire sauce, salt and pepper, and cook for 1 minute. Add the garlic and lemon juice and cook 1 more minute, stirring frequently. Allow to cool for a minute, then taste and add additional salt if desired.