Cut a contrasting piece 8” square. This will be in the center of your snack mat.
Cut a piece of scrap batting into a 9” square.
Fold the background and contrasting piece in half to find the center of each piece. Mark that by pinching the fabric to form a crease or using a pin, if you prefer. See photo at right.
Centering the contrast piece on the background matching creases on each, right sides together, stitch ¼” seam on both sides. Turn right side out. You now have a tube, and have about 1” of the background fabric showing on each side of the contrasting piece. See photo below.
Press well, with steam. Insert the piece of batting into the center, between the two pieces, making sure approximately the same amount of batting shows at the top and bottom of the contrasting piece.
Fold the corners of the background piece in to meet the batting, forming a small triangle on each corner, as shown in the photo, above right. Press under ¼” seam allowance on each raw edge. Fold the two ends down over the center contrasting piece, and they will automatically form neat, mitered corners. Pin at the corners and center of the edges to secure for sewing.
If your machine does decorative stitches, you can attach both ends with a decorative stitch… no need to stitch it down separately first. I used a decorative stitch all the way around, removing pins as I came to them. After completing the stitching, I returned to a straight stitch and sewed the mitered corners down.