Begin by melting butter. Add brown sugar and mix well. Pour butter and brown sugar mixture into the bottom of a 9×13.
Add a layer of Texas toast. In a medium bowl, whisk together eggs, milk and vanilla.
Pour half of egg mixture over the Texas toast and sprinkle brown sugar and cinnamon on top. Add another layer of Texas Toast. Spread a thin layer of butter over bread.
Top with the remaining egg mixture and top with your cinnamon and sugar mixture.
Refrigerate overnight or for at least 4 hours before baking.
When ready to bake, bake at 350 for 40-45 minutes.