01 - Warm olive oil and 2 tablespoons of butter in a large skillet over medium-high heat.
02 - Place mushrooms in a single layer and cook without stirring for 3 to 4 minutes until one side is browned.
03 - Stir mushrooms, then add minced garlic; cook for 3 to 4 minutes, stirring occasionally, until fragrant and golden brown.
04 - Incorporate sea salt, black pepper, and optional chili flakes evenly over the mushrooms.
05 - Add remaining 1 tablespoon butter and chopped parsley; toss thoroughly to coat.
06 - Remove from heat, drizzle with lemon juice if desired, and serve immediately.