STEP 3: Transfer to a stand mixer fitted with the hook attachment and knead for about 3 minutes, then transfer to a lightly floured surface and knead by hand for another minute.
STEP 5: To make the filling, combine brown sugar, butter, sugar, cinnamon, vanilla, and salt. Spread onto dough, leaving a border around the edges, and press the filling in with your hands.
STEP 6: Starting with one of the short edges, gently roll the dough. Pinch edges to seal. Use a knife to cut into 12 even pieces. Arrange into your prepared muffin pan and bake for 25-30 minutes.