For outies, perhaps the easiest way would be to 'birth' the quilt.
Baste the prairie points onto the top - facing inward - right against the raw edge. Layer the batting backing and top (think about this so that you have them in the proper order!), sew around the edges with the usual 1/4"+ seam allowance leaving an opening large enough to turn the whole thing inside out. The prairie points will now be facing outward.
When I birth a quilt, which is rarely, I prefer to hand baste the batting to the backing before layering. Then I layer them batting on top, then backing (to which the batting is basted), then the top face up. Sew and turn.
Jan in VA