Bowl Cozy Stitching Guide. A Sewing Hack. No marking needed. 

...This is the easiest quickest version on how to make a Reversible Bowl Cozy for Microwaving hot soup or using it for eating ice cream in a bowl.
No tricky cutting.
Start off with 2 10" squares of cotton and 2 SCANT 10" squares of 100% cotton batting.
a slightly smaller batting makes the edges less bulky during the sewing process.
This is a great way to use up leftover pieces of layer cake stacks. If you are new to quilting, a "Layer Cake" is a term used for a stack of 10" precut squares of multicolor coordinates of quilter's cotton fabrics. Cotton Batting is used as filler between the top and bottom layer of a quilt. If you are already a seasoned quilter, you will have some leftover batting for this project.
Before you begin the project, you can make your own Bowl Cozy Stitch guide, so you don't have to measure each dart. Get a firm business card stock and make a mark on the east side of the square 2.5" high and 1.25 inches on the east to south side of the square. Trim the right triangle away. I'll have another simple tutorial to show you how. check back for the link.
1. Iron or press and crease like origami a cross on each of the cotton pieces. These are your registration lines to sew on in step 3.
2. Match one cotton square on top of one square of batting.
1:07 3. Sew the cross on the pretty side of the fabric.
2:11 4. fold the square in half with the batting on the outside.
2:36 5. line up the bowl cozy stitch guide along the right side fold.
6. sew along side it. I stitch about 1/8" away from the guide. Repeat 8 times on all of ..............the folds for both pieces.
6:10 7. trim off the excess dart material.
6:57 8. turn one facing into the other pretty side, so the top and bottom match.
7:34 9. Sew 1/4" all around, starting 1" before a corner. Sew 1" on both corners, and leave 3" open to turn the right side out. Trim the corners to reduce excess bulk at the corners.
10:25 10. Turn it right side out, and poke the corners as best as possible.
11. sew all around the edge around 1/4" away from the edge. Loosen your presser .................foot, because the layers of the fabric are bulky.
Done!
By using a business card, and trimming off an angle 1.25” wide and 2.5” tall, cutting away the right triangle piece, I line it up at the darts and see along side of it to avoid marking my darts or pre-cutting my pieces.
Let me know what you think in my comments below.