If you’re concerned about the potential for bacteria in raw flour, you can quickly heat treat it by spreading it out onto a baking sheet and toasting it at 350°F for 5 minutes. Let it cool, then follow the instructions above. Just note that the sprinkles in the funfetti cake mix may discolor or become a bit melty and spread. But don't despair - that's just more reason to add even more sprinkles :)