In a bowl, combine the dry ingredients together.
Next, in another bowl combine the milk, whipped egg, cooled melted butter, vanilla, lemon juice if using, and the granola.
Add the wet ingredients into the dry ingredients and with a spatula stir to thoroughly incorporate and combine.
Pour and spread batter into a greased 9x9 square baking pan. Bake at 350 degrees for 30 to 35 minutes till light golden brown and a toothpick comes out with minimal crumbs.
Whenever possible use organic ingredients.