Preheat oven to 375°F. Line a 12-cup muffin tin or lightly grease it.
Soak the wheat bran in buttermilk in a bowl; let stand 10 minutes to hydrate.
Whisk flour, baking powder, baking soda, salt, and cinnamon in a separate bowl.
Beat brown sugar, oil, egg, vanilla, and molasses in a large bowl until smooth.
Stir the soaked bran mixture into the wet ingredients until combined.
Fold in the dry ingredients just until no dry streaks remain, then gently fold in raisins.
Divide batter among cups, filling each about 3/4 full.
Bake 16–19 minutes until a toothpick comes out clean. Cool 5 minutes, then transfer to a rack.
Notes
Try adding orange zest or chopped nuts for a twist. Swap raisins for blueberries (use frozen, unthawed) to keep the batter thick. Store muffins airtight at room temperature for 2 days or freeze up to 2 months; rewarm in a 300°F oven for 8–10 minutes.This recipe is an original creation inspired by classic Bran Muffins Made Easy flavors. All ingredient ratios and instructions are independently developed.