Broccoli Beef Tater Tot Hotdish

Name: Broccoli, Beef & Tater Tot Hotdish
Ingredients: 1 ½ pounds broccoli, cut into 1-inch florets; 2 tablespoons canola oil, divided; 1 ½ pounds 95%-lean ground beef; 1 large onion, chopped; 2 tablespoons Worcestershire sauce; 1 teaspoon garlic powder; 1 ¼ teaspoons salt, divided; 4 cups low-fat milk; ⅓ cup cornstarch; 2 cups shredded sharp Cheddar cheese; ¼ teaspoon ground turmeric; 4 cups frozen tater tots or veggie tots; ½ teaspoon ground pepper; Canola or olive oil cooking spray