Allow steaks to rest at room temperature for 30 minutes.
Heat grill to medium-high or high heat.
Lightly coat both sides of the steaks with olive oil and season to taste with kosher salt and pepper.
Grill steaks over direct medium-high heat until desired temperature. For medium-rare, grill for 4½ minutes per side. Remove steaks from grill and allow to rest for 5 minutes.
While steaks are resting, combine olive oil, mushrooms and herbs in a mixing bowl and season to taste with kosher salt and pepper. Transfer mushrooms to a grill basket and place basket on the grill. Cook for 5–10 minutes, occasionally moving mushrooms around until they begin to brown.
Spoon grilled mushrooms over steaks and serve warm.