Portobello Mushroom Burger with Avocado Chimichurri recipes

Name: Portobello Mushroom Burger with Avocado Chimichurri recipes
Ingredients: 2 large portobello mushrooms; 1 red bell pepper, sliced into ¼ inch rings; ½ red onion, peeled and sliced into ¼ inch rings; large handful of fresh spinach; extra-virgin olive oil; 1 teaspoon dried oregano; kosher salt; freshly ground black pepper; 1 avocado, peeled and pitted; 3 cloves garlic, peeled; ¼ cup olive oil; ¼ cup flat leaf parsley leaves; ¼ cup cilantro leaves; juice of 1 lemon; 1 teaspoon red wine vinegar; pinch of red chili flakes; 2 pieces flatbread pitas or 2 soft burger buns; smoked mozzarella