Heat-Treat Flour: Heating the flour will kill any bacteria present if theres any. To make raw flour safe to eat, place on a baking sheet and bake at 350 degrees F for about 5-10 minutes. Just be sure it doesn’t burn. You can also microwave the flour which would be the quickest and easiest way. Place the flour in a bowl and heat on high for 20-45 seconds. Each microwave is different, so please be mindful of the temperature.