With a pencil or water-soluble marking tool, mark the perimeter around the design you want to use. Leave at least 3/8" space to cut. Continue this step for as many coasters as you wish to make.
Using your cut circles as a template, trace these shapes onto your lining fabric, with right sides facing together.
Stack your two cut fabrics onto your batting. We are creating a fabric stack- from the top - main fabric wrong side up, lining right side up, and batting layer. Cut your shapes once again. You can add a second layer of batting for a thicker coaster, but for this set, I used one layer. We are leaving our stack in this order to sew.
On each piece, mark where to leave an opening to turn your coaster right sides out. Try to pick a spot with a straighter line that is roughly 1 1/2"- 2".
Baste all the way around your coaster, roughly 3/8" from the outline of your design, leaving the opening clear of stitching.
Using your satin stitch foot, stitch close to your design. I lined the open edge of my presser foot (next to my red triangle) up to the border of my flower, which left about 1/16" of space. When my coaster gets flipped right sides out, I will be able to see the full black border. Again, leave an opening to turn your coaster!
Trim all the way around your design. Get close to your stitching, but be careful not to cut through. Leave more seam allowance at the coaster opening. If you have some tight spaces, clip into corners (but not through stitching!)
Turn coasters right sides out and press. Using a turning tool, push fabric out, making sure all your corners are turned out. Turn the seam allowance of your coaster opening in and press. You can either top stitch this seam or hand stitch shut. Mine is topstitched.
I wanted the edges of my coasters to pop, and to be able to hide some of the spots where I couldn't sew close enough to my flower, so I added an applique stitch all the way around my coaster! This step is optional but I love the final look!
Final step is to add some detail stitching! On each flower I added stitching in a lighter color thread to make the design pop!