Preheat oven to 350F
Cook chicken breakfast sausage in skillet with oil on medium high until no longer pink. Remove from pan and set aside.
Add spinach and cook for 1-2 minutes until spinach is wilted.
Whisk eggs milk, yogurt, garlic and parmesan.
Spray 9 x 13 pan and spread cubed bread evenly over the bottom. Add spinach evenly on top of bread.
Pour whisked egg mixture over bread, move pieces around to make sure they are well soaked.
Top evenly with chicken mixture.
Bake for 55-60 minutes until eggs are set. Remove from oven and let cool for 10 minutes before serving.