Buffalo Meatloaf with Spinach and Roasted Baby Potatoes

Name: Buffalo Meatloaf with Spinach and Roasted Baby Potatoes
Ingredients: 1 pound baby Yukon Gold or Dutch yellow potatoes; 5 tablespoons olive oil, divided; 1 1/2 cups chopped crimini (baby bella) mushrooms; 1 cup chopped red onion; 1 tablespoon chopped fresh sage; 1 tablespoon chopped fresh thyme; 1 pound ground buffalo meat; 1 large egg; 3/4 cup tomato sauce, divided; 1/2 cup panko (Japanese breadcrumbs)*; 1/2 teaspoon salt; 1/2 teaspoon cracked black pepper; 1/4 teaspoon dried crushed red pepper; 1 garlic clove, pressed; 2 5-ounce bags fresh spinach