I think the simplest way would be to cut 2 squares of the Minky. Stay stitch along 2 bottom edges to prevent raveling and stretch, put the 2 squares right side together and pin all around. I would then stitch all around leaving an opening on the bottom where the stay stitching is to turn and stuff. I would hand stitch the opening closed or machine stitch it with matching thread since the Minky pile will hide the stitching.