1. Heat a large nonstick skillet over medium-high heat. Add oil; swirl to coat. Add sausage; sauté 3 minutes or until browned. Add onions, thyme, and garlic; sauté 5 minutes. Remove from heat.
2. Bring milk to a simmer in a large saucepan. Reduce heat to medium-low. Stir in polenta and salt; simmer 7 minutes, stirring frequently with a whisk. Remove from heat. Add cheeses; stir until cheeses melt. Place the polenta mixture in a large bowl; let stand 15 minutes, stirring occasionally. Stir in pepper sauce and eggs. Add sausage mixture; stir well to combine. Spread polenta mixture into a 2-quart glass or ceramic broiler-safe baking dish coated with cooking spray. Cool to room temperature. Cover surface with plastic wrap; refrigerate overnight.
3. Preheat oven to 425°.
4. Uncover dish. Bake at 425° for 25 minutes or just until set.
5. Preheat broiler to high; remove dish while broiler preheats. Broil 2 minutes or until top is lightly browned. Let stand 5 minutes.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.