Spray a 9x13 glass pan generously with non-stick cooking spray. Set aside.
In a small soup pot, melt the butter over medium heat. Whisk the coconut sugar into the melted butter. DO NOT BOIL or you will end up with caramel. Remove the pan from the heat. Pour into the prepared glass pan.
8 Tablespoons (1 stick) butter, 1 cup coconut sugar
Arrange the bread cubes on top of the butter/sugar sauce.
1 loaf (14 oz) French bread, cut into 1" pieces
In a large mixing bowl, whisk together the eggs, eggnog, vanilla, cinnamon, nutmeg, and salt, to make the custard. Pour the custard evenly over the bread cubes. Press down gently on the bread to soak up the custard mixture.
Tightly cover the pan with aluminum foil or a lid. Refrigerate for at least 2 hours or up to 12 hours (overnight).
Preheat the oven to 350F. Remove the pan from the fridge and bake covered with aluminum foil for 45 minutes. Remove the foil and bake an additional 15-20 minutes or until the entire casserole is puffed and golden brown on top. A knife inserted into the middle should come out relatively clean.
When serving, drizzle with maple syrup, homemade eggnog glaze (powdered sugar and eggnog combined into a smooth consistency), or whipped cream!
Notes
Ingredient Tips - Any bread works in this recipe. If choosing a different type of bread, just make sure you have at least 14 ounces of it. We love making homemade eggnog from Lauren's recipe at Oatmeal with A Fork. However, the So Delicious brand has an excellent one that has very clean ingredients.Prep Tips - This recipe can be reduced by half and baked it in an 8x8 pan.