Preheat the oven to 350°F and grease a 13 x 9 in. baking dish.
Place the bread cubes in the greased baking dish; set aside.
In a large bowl, combine eggs, milk, greek yogurt, maple syrup, vanilla and salt. Pour evenly over the bread cubes. Use a spoon to carefully coat all the bread cubes with the batter.
Top the french toast with the chopped pecans. Then pour the maple syrup over the pecans and sprinkle the cinnamon.
Bake in the preheated oven for 40-50 minutes, or until a knife inserted in the center comes out clean. If top starts browning too quickly, loosely cover with foil for the last 10 minutes to prevent the casserole from drying out.
Let stand for 5 minutes to cool. Serve with maple syrup if desired.