Amazing Venison Meatloaf

Name: Amazing Venison Meatloaf
Ingredients: cooking spray; 1.5 pounds ground venison; 0.5 pound pork sausage (such as Jimmy Dean®); 1 onion, chopped; 2 onion sandwich buns (such as S. Rosen's®); 2 large eggs; 1.5 fluid ounces brandy (such as Christian Brothers®); 1 tablespoon bacon grease; 1 teaspoon Worcestershire sauce; 1 teaspoon dried thyme; 1 teaspoon red pepper flakes; 0.5 teaspoon seasoned salt (such as LAWRY'S®); 0.5 teaspoon garlic and herb seasoning (such as McCormick®); 0.5 teaspoon finely ground black pepper; 0.25 teaspoon ground sage