Why can't you add flour to mashed potatoes?

Online Answer
To summarize, flour needs to gelatinize to be palatable and thicken. This happens at simmering temperatures and there must be liquid for the flour to absorb. A roux is commonly made to thicken because a roux can add flavor, and because the fat lubricates the starch, won't clump up a sauce if enough whisking is done..
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Raw flour is never safe to consume. You could be exposing yourself to bacteria, animal droppings, or other contaminants. Make sure that foods that contain raw flour are completely cooked before eating them – it could make all the difference for your health. Learn how to heat treat flour.
It's a good idea to shake off any excess flour so that the coating doesn't turn pasty or gummy. The standard breading technique involves first dredging the item with flour, dipping it in egg wash, and then finally coating it with breadcrumbs.
Use half as much cornstarch as you would flour. For example, if the recipe calls for 2 tablespoons of flour, use 1 tablespoon of cornstarch. If the recipe calls for 1/4 cup of flour, use 1/8 cup of cornstarch. (The same is true for other starches, such as arrowroot starch, potato starch, and tapioca.).
Almond flour adds texture and flavor, and is well-loved by those following a paleo diet. It can be used in pie crusts, cakes, cookies, pancakes, and breads. ... It also makes a great addition to your grain free baking recipes and is finely ground to create incredible cookies, pancakes, breads, and more.
Here are 5 alternative flours to try:
  • Buckwheat Flour. Despite containing the word "wheat" in its name, buckwheat flour is totally unrelated to wheat. ...
  • Almond Flour. Almond flour is the perfect introduction into the world of alternative flours. ...
  • Chickpea Flour. ...
  • Cassava Flour. ...
  • Oat Flour.