A Guide to Gluten-Free Flour
Most gluten-free baking problems come down to one thing: treating gluten-free flour as a single ingredient when it is really a category of very different ones. Here is what separates them.
Start here: use a blend, not a single flour
If a recipe says gluten-free flour without qualifying it, it almost always means a 1-to-1 or measure-for-measure blend. These are engineered mixtures — usually a base of rice flour, several starches, and a binder — designed so you can swap them for wheat flour by weight and get something close to the original.
Single flours are not interchangeable with them and not with each other. Almond flour is mostly fat and protein with no starch. Coconut flour absorbs several times its weight in liquid. Rice flour alone is gritty and binds nothing. Swapping any of these one-for-one into a recipe written for a blend will not work, and no amount of adjusting will rescue it.
The short version. Buy a blend labelled 1-to-1 or measure-for-measure that already contains xanthan gum. Weigh it rather than measuring by cup. Let the batter rest before baking. Those three things solve most gluten-free baking problems.
What each flour actually does
| Flour | Behaviour | Best for |
|---|---|---|
| 1-to-1 blend | Engineered to behave like wheat flour by weight. Usually contains xanthan gum. | Almost everything — cookies, muffins, cakes, quick breads |
| White rice flour | Neutral, cheap, slightly gritty on its own. The base of most blends. | Blends, not solo baking |
| Brown rice flour | Nuttier and heavier than white rice flour, with more fibre. | Blends, heartier bakes |
| Almond flour | High fat, no starch, no binding. Adds moisture and richness. | Recipes written for it specifically |
| Coconut flour | Extremely absorbent. A small amount replaces a lot of flour and needs far more liquid and egg. | Recipes written for it specifically |
| Oat flour | Soft, mild, slightly sweet. Not always gluten-free — check for certification. | Muffins, pancakes, cookies, as part of a mix |
| Tapioca and potato starch | Light, stretchy, help with chew and browning. No structure on their own. | Blend components |
What xanthan gum does, and when you need it
Gluten does two jobs in wheat baking: it forms an elastic network that traps gas, and it holds the finished crumb together. Nothing in a gluten-free flour does either. Xanthan gum is the usual stand-in — a tiny quantity makes the batter viscous enough to hold air bubbles and stops the baked result crumbling when you pick it up.
Most 1-to-1 blends already include it, in which case add none. Doubling up gives a gummy, slightly slimy texture. Check the ingredient list on the bag before you add anything.
If your blend does not contain it, rough starting points are about 2 g (½ tsp) per 250 g of flour for cookies and muffins, and roughly double that for bread. Psyllium husk is the better choice for yeasted bread specifically — it holds far more water and gives a dough you can actually shape.
Recipes using a 1-to-1 blend
Weigh it, do not scoop it
Volume measuring is unreliable with wheat flour and worse with gluten-free blends, because the starches in them settle and compact differently from bag to bag. A cup scooped straight from the packet can weigh 20 to 30 per cent more than one spooned in and levelled — enough to turn a soft cookie into a dry one.
Every recipe on this site gives gram weights alongside cups for exactly this reason. If you bake gluten-free regularly, a scale is the single most useful thing you can buy.
Let the batter rest
Gluten-free starches absorb liquid much more slowly than wheat flour does. Batter that looks correct straight after mixing is often still hydrating, and baking it immediately traps that dryness in the finished crumb — which is where the sandy, gritty texture people associate with gluten-free baking comes from.
Five to ten minutes is enough for muffins and cookies. It costs nothing and it is the most reliable improvement you can make to almost any gluten-free recipe.
Cross-contact, if it matters medically
Naturally gluten-free ingredients are frequently processed on shared equipment. Oats are the common example — the grain contains no gluten, but most oats are milled alongside wheat. Broth, soy sauce, baking powder and chocolate chips are all worth checking too.
If you are cooking for coeliac disease or another medically necessary gluten-free diet, use certified products and keep separate boards, toasters and utensils.