French Toast Casserole

Name: French Toast Casserole
Cuisine: European, Mediterranean, French
Ingredients: 1 loaf of bread (about 18 slices); 1/2 cup sugar (brown, white or any sweetener you prefer); 1 tsp. cinnamon; 3/4 cup milk (cow's, almond, coconut or any milk you prefer ); 2/3 cup flavoured coffee creamer; 4 eggs; 1/4 cup butter (melted); 3 Tbsp. maple syrup; 1 tsp. vanilla extract; additional maple syrup; 1/2 cup oats; cinnamon