Clean the mushrooms and trim the dried pieces of the stems.
In a medium skillet over medium heat, heat the olive oil and 1 Tablespoon of butter. Add the mushrooms and season with 1 teaspoon of Kosher salt. Stir and cook undisturbed for about 3 minutes.
While the mushrooms are cooking, mix the spices - paprika, onion powder, dried oregano, dried tarragon, pepper, and chili powder - and set aside.
Next, add the spice mix and garlic. Stir and cook for another 1-2 minutes.
(Optional Step: if desired, stir in the browning sauce and cook for 1-2 minutes until the mushrooms are coated and the sauce is reduced. Browning sauce gives everything a dark look and adds sweetness.)
Stir in the Worcestershire sauce and soy sauce. Cook for about 2-3 minutes to reduce the sauce. The mushrooms will also absorb much of the liquid. Finish with the remaining 1 Tablespoon of butter.
Garnish with chopped chives and serve!