Herby Fish with Wilted Greens & Mushrooms

Name: Herby Fish with Wilted Greens & Mushrooms
Prep time: 25 min
Total time: 25 min
Cuisine: American
Ingredients: 3 tablespoons olive oil, divided; 0.5 large sweet onion, sliced; 3 cups sliced cremini mushrooms; 2 cloves garlic, sliced; 4 cups chopped kale; 1 medium tomato, diced; 2 teaspoons Mediterranean Herb Mix (see Associated Recipes), divided; 1 tablespoon lemon juice; 0.5 teaspoon salt, divided; 0.5 teaspoon ground pepper, divided; 4 (4 ounce) cod, sole, or tilapia fillets; Chopped fresh parsley, for garnish