How to make Quilted Coasters with Binding

I've been making some coasters lately and I'm totally addicted to them. They have a top and bottom layer and in between I have sandwiched cotton batting to absorb any spills and interfacing for support. The four layers are sewn together using freehand machine stitching.

Cotton sandwich

I stacked the pieces together,in that order, to form a type of fabric sandwich.

Reverse side

The binding is turned out, and pinned to the back of the coaster with the raw edges folded in and the corners mitered again.

Pressed and ready to go