Dense buns are often caused by inactive yeast, insufficient rising time, or adding extra flour because the dough seems unusually sticky. This dough is supposed to remain tacky. Make sure the yeast becomes visibly foamy before mixing the dough, allow the shaped buns to become noticeably fuller before baking, and use wet hands for shaping instead of adding more flour.
Psyllium absorbs liquid and develops a flexible gel that helps bind the gluten-free flours together. It provides some of the elasticity and structural support that gluten would normally supply in wheat bread. Psyllium husk powder absorbs moisture differently from whole psyllium husks, so using the powder gives the most predictable result in this particular dough.
I would not recommend making a direct one-for-one replacement. Almond flour contributes fat, moisture, and tenderness, while brown rice flour behaves quite differently. Adding extra rice flour can make the buns considerably drier and more crumbly. A tested gluten-free substitution is preferable when almond flour must be avoided.
The yeast may be old, the room may be particularly cold, or the milk may have been too hot. Aim for approximately 43°C / 110°F when warming the dairy-free milk. If the mixture shows virtually no activity after about 20 minutes, starting again with fresh yeast is safer than continuing with a dough that may not rise properly.
These buns have their best texture on the day they are baked. Once completely cool, place leftovers in an airtight container and refrigerate them for up to 2 days. For longer storage, slice the buns first and freeze them in a well-sealed freezer bag for up to 1 month.
Frozen buns are especially good when reheated by toasting. You can very lightly moisten the frozen bun before warming it, which helps restore some softness to the crumb. Alternatively, warm it briefly in an oven at about 175°C / 350°F until heated through, then toast the cut surfaces if you want a slightly crisp finish.
*Values are approximate. Nutritional values may vary depending on the dairy-free milk, vegan butter, ingredient brands, exact quantities, and preparation method.
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