Preheat oven to 400° + lightly oil a small baking dish; chop cauliflower into 1-inch pieces + heat 1 tbsp oil in skillet over med-high; cook cauliflower with salt/pep 4-5 min, then add 2 tbsp water, reduce heat, cover + steam 2-3 min until tender; set aside

Wipe mushrooms clean + thinly slice; heat 1 tbsp oil in skillet over high, add mushrooms + cook undisturbed 3 min; sauté 3-4 min until browned + tender, then season with salt/pep

Add veggies to baking dish, top with ¼ cup sauce + ¼ cup sour cream; bake 12-15 until hot; garnish with ¼ cup salsa + chopped cilantro