Mix your liquids. In a bowl mix together the  eggs, milk, heavy cream, salt, and vanilla extract. Whisk together until fully combined. Set aside.

Soak Bread. Place the bread cubes in a greased 9×13 inch casserole dish and pour the egg mixture over the bread making sure to moisten all of it. Cover with plastic wrap and place in refrigerator for at least 3 hours, preferably overnight.

Preheat & Bake. Remove the casserole from the refrigerator, take off the plastic wrap, and let it stand while you preheat oven to 375 degrees F. Once preheated place the casserole in the oven and bake for 45 – 55 minutes. When the casserole has finished baking remove from oven and let cool for 10-15 minutes.