Preheat your oven to 375°F (190°C) and line a baking sheet like a responsible adult.
Brush mushroom caps with olive oil, place gill-side up, and sprinkle lightly with salt.
Sauté onions in a skillet over medium heat until soft—about 5 minutes of tears (emotional or onion-induced).
Add garlic, cook for 1 minute, then throw in the chopped spinach. Stir until wilted and dramatic.
Remove from heat and mix in vegan feta, lemon juice, salt, and pepper. Pretend you’re on a cooking show.
Spoon the filling into each cap generously like you’re stuffing emotional baggage into a carry-on.
Sprinkle breadcrumbs on top if using—extra crunch equals extra fancy.
Bake for 20–25 minutes until mushrooms are tender and tops are golden and slightly crisp.
Garnish with parsley. Or don’t. You’re the boss.
Serve warm, smug, and satisfied.