Marinated Cauliflower Steaks and Veggies

Ingredients

• 1 head cauliflower, sliced 1-inch thick, reserving any extra or broken pieces
• ½ cup vegetable oil
• ¼ cup water
• 2 tablespoons Brazilian steakhouse seasoning
• ¼ teaspoon thyme
• ½ teaspoon onion powder
• Freshly cracked black pepper, to taste
• 1 bunch yellow oyster mushrooms, washed and broken apart
• 8 ounces cremini mushrooms, washed and sliced
• 3 cloves garlic, minced
• 2 tablespoons extra-virgin olive oil
• 1 ½ tablespoon curly parsley, chopped, divided
• 1 dash red pepper flakes (optional)
• 2 yellow onions, sliced ½-inch thick
• 1 bunch fresh spinach, washed
• 1 cup heirloom grape tomato medley
• ¾ cup grated Parmesan-Romano cheese blend
• ¼ cup unsalted butter