Place three pecan halves each in 12 ungreased muffin cups. Evenly divide butter over pecans and sprinkle with brown sugar. Bake at 375° for 5 minutes or until butter and sugar are melted.
Meanwhile, combine biscuit mix and banana to form a soft dough. On a lightly floured surface, knead dough 5 times. Roll into a 15x9-in. rectangle. Spread with butter; sprinkle with brown sugar. Roll up, jelly-roll style, starting with a long side; seal the seams. Slice into 12 rolls; place cut side down in muffin cups. Bake at 375° for 12-14 minutes or until golden. Cool 1 minute; invert onto a serving platter. Serve warm.