Savory Venison Wild Rice Bake

Name: Savory Venison Wild Rice Bake
Prep time: 45 min
Cook time: 20 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 1 pound ground venison (seasoned with salt and pepper); 6 cups low sodium chicken stock (divided); 1 cup long grain rice; 1 cup wild rice; 2 cups carrots (diced); 1 ¼ cup onion (1 large, diced); 1 ¼ cup celery (6 stalks, diced); 2 cups broccoli (diced); 1 cup mushrooms (sliced); Olive oil; 4 cloves garlic (minced); 1 teaspoon pepper; 1 teaspoon salt; 2 teaspoons sage; 2 teaspoons thyme; 1 cup milk; 3 tablespoons butter; 3 tablespoons flour