Vegan Mushroom Meatloaf

Name: Vegan Mushroom Meatloaf
Ingredients: 8 ounces cremini mushrooms; 1 large yellow onion; 4 cloves garlic; 1 tablespoon olive oil; 2 teaspoons kosher salt, divided; 3 tablespoons soy sauce or tamari; 2 tablespoons tomato paste; 1 cup old-fashioned rolled oats; 1/2 cup raw cashews; 1/2 cup roasted, unsalted sunflower seeds; 2 tablespoons cornstarch; 1 teaspoon dried thyme; 1/2 teaspoon freshly ground black pepper; 1/2 teaspoon ground sage; 2 (about 15-ounce) cans kidney beans; 2 cups cooked brown rice; 1/3 cup ketchup; 3 tablespoons packed brown sugar; 1 tablespoon apple cider vinegar