Preheat a small saucepot over medium-high heat with 1 turn of the pan of EVOO. Add the onion, garlic and season with salt and pepper. Cook them stirring frequently for about 3-4 minutes. Add the grainy mustard, hot sauce, chicken stock and cream.
Bring it up to a simmer and cook until thick, about 2-3 minutes. Turn the sauce off and reheat it when youre ready to serve.
Place the bread in the food processor and use the pulse button to break it up then let it rip and make fine breadcrumbs.