Do you have a stitch in the ditch foot for your machine? It has a long tongue on the left and a piece of thin metal down the center with a little divot where the needle fits in. When stitching in the ditch, that divot moves the fabric away from the seam and after sewing, the fabric moves back to cover the stitching. Okay that's the original purpose for the stitch in the ditch foot.
I cut binding at 2 1/4 to 2 1/2 inches wide, fold and gently press, sew to the back of the quilt at 1/4 to 3/8 inches, fold to the front. Now set up your stitch in the ditch foot so that your needle is to the RIGHT of that little divot. On my machine, center is 3.5 and I need to move the needle to the right about 7 little clicks. Align the fabric along that long tongue and lower the presser foot. You will see that the divot is pushing the fabric TOWARDS the needle. I have found that it gives a nice crisp edge to my machine sewn binding.