The hot sauce adds flavor but does not make the bisquick breakfast casserole spicy. Original Cholula, Frank’s RedHot, and Sweet Baby Ray’s Original Hot Sauce are all good options to use here. If you are still unsure, try just 1-2 dashes at first. You can also omit the hot sauce entirely. If you do want a spicier breakfast casserole, use a spicier hot sauce, add a couple extra dashes, and/or try adding a small can of hot green chiles or diced jalapeños to the mix.