Prep: Wash and thoroughly dry the cauliflower and mushrooms.
Sauté Aromatics: In a large skillet, heat 1 tbsp olive oil over medium. Sauté shallots for 2 minutes.
Sear Mushrooms: Increase heat to medium-high. Add remaining oil and mushrooms in a single layer. Cook undisturbed for 3-4 minutes until golden.
Caramelize Cauliflower: Add cauliflower and oregano. Stir and cook for 8-10 minutes, tossing occasionally, until cauliflower is tender and charred on the edges.
Garlic & Finish: Stir in minced garlic, salt, and pepper. Cook for 1 minute.
Brighten: Remove from heat. Stir in lemon juice and fresh parsley. Top with feta if desired.