Portobellos with Ratatouille Recipe

Name: Portobellos with Ratatouille Recipe
Ingredients: 1 large onion, chopped; 1 tbsp plus 1 tsp olive oil, divided; 5 garlic cloves, minced, divided; 1 small eggplant, peeled and cubed; 2 medium zucchini, cubed; 1 medium sweet red pepper, chopped; 1/4 cup tomato paste; 2 tsp red wine vinegar; 1 tsp minced fresh thyme; 1/2 tsp salt; 1/8 tsp pepper; dash cayenne pepper; 2 medium tomatoes, chopped; 4 large portobello mushrooms (4 to 4-1/2 inches); 2 packages (6 oz each) fresh baby spinach; minced fresh parsley and shaved parmesan cheese