Preheat oven to 400 degrees
Begin by slicing your tempeh in half so that you have 4 squares. Note- if too thick, you can slice them each across individually
In a medium sized bowl, mix all breading ingredients together with a whisk until smooth and set aside
In a separate flat dish, measure out the breadcrumbs
Take each piece of tempeh and coat with the flour mixture, then in the breadcrumbs and transfer to a parchment paper lined baking pan. Repeat until all tempeh pieces are covered and cook for 30 minutes, flipping halfway through
While the tempeh is cooking, mix together the melted butter and buffalo sauce and set aside
When the tempeh is done cooking, coat each piece in the sauce and butter mixture and place back in the oven for 10 minutes.
During this time, begin preparing your toppings if you choose (lettuce, tomatoes, avocado, vegan ranch sauce...etc)
Once done, remove from oven and begin building your sandwich. Top with more buffalo sauce if you'd like and enjoy!