โญ Oat Flour (Best Gluten-Free Option)
1:1 ratioOat flour is made from finely ground oats and is naturally gluten-free, which means it lacks the gluten proteins necessary for structure and elasticity in muffins. When used as a 1:1 substitute for all-purpose flour, oat flour contributes a mild sweetness and a tender crumb but can cause the muffins to be crumbly and dense. To compensate, it is common to add a binding agent such as xanthan gum (about 1/4 teaspoon per cup of oat flour) or an extra egg to improve cohesion. Oat flour also absorbs more moisture, so increasing liquid ingredients by 10-15% can help maintain moistness. It is an excellent choice for gluten-free or whole-grain muffins if these adjustments are made.