First, preheat oven to 350ºF. Generously spray a 10-inch x 7-inch casserole dish* with nonstick cooking spray.
In a medium bowl, whisk together eggs, peanut butter, almond milk, maple syrup, cinnamon, vanilla extract, and salt. The peanut butter won't completely dissolve, but whisk until it's broken up and somewhat combined. Set aside.
Then, slice an entire loaf of bread into bite-sized squares (3x3). Place bread on the bottom of your dish.
Slice 1 large banana and toss with bread chunks.
Then, pour on egg mixture. Use your hands to submerge bread chunks into the liquid until everything is combined.
Cover with tin foil and bake at 350ºF for 30 minutes. Then uncover and cook for an additional 15 to 20 minutes or until the French Toast Bake is firm in the middle.
Let French toast bake cool for at least 10 minutes before slicing into 6 servings. Serve with more sliced banana, a drizzle of peanut butter, and maple syrup.