French Onion Tater Tot Casserole

Name: French Onion Tater Tot Casserole
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: American
Ingredients: 2 tablespoons butter; 2 tablespoons olive oil; 2-3 medium yellow onions, thinly sliced; 1 cup dry white wine, such as Pinot Grigio or Sauvignon Blanc, divided; 1 pound ground beef; 2 cloves garlic, minced; 16oz mixed frozen veggies, thawed; 2 teaspoons dried thyme; 2 teaspoons dried parsley; 2 tablespoons flour; 1/4 cup soy sauce; 1 tablespoon Worcestershire sauce; 1/4 teaspoon cayenne pepper; 1 cup water; 1 cup shredded Gruyere cheese; 2 pounds frozen tater tots; 1 cup shredded cheddar cheese; Fresh chives, for topping (optional); Salt and pepper to taste