I have made dozens of these, and always get compliments from those receiving them, how useful they are: Just like pot holders so you don't burn your fingers.
Microwave dish holders, which you can use to heat other items such as soup, stews, Buns, potatoes, canned veg's, cauliflower, broccolli, (After I wash the vegetables, there is enough moisture on them to cook, to the crunchy stage - 2 minutes) etc.
This will make one: You can make them larger if you like...
Cut 2 pieces of fabric, 10 inches square
Cut 2 pieces of cotton batting also 10 inches square,
Lay 1 piece of cotton batting on one of the squares of fabric. Fold these in half, then in half again, and press with your iron, so you can see the four sections.
On the fold of each section, (this will be 5 inches from each cut edge of your fabric and batting) starting at the outside edge and 1 inch over from the fold start sewing, and sew down at an angle 2 inches right off the edge at the fold (this will be approx. 3 inches from the centre of your fabric).....
If you did not sew down this seam, it would look like a "V" cut out of the centre folded edge on all four sides with the point being closest to the centre of your piece of fabric/batting.
Now do the same with your next 10 inch piece of fabric and batting.
Next lay the right sides together, and sew around all of the three sections - leaving one section open, trim each corner to reduce the bulk, and now you can turn it right side out, push all the corners out to nice points, then stitch around all four sides - starting at the opening, once you have done that, sew an "X"
in the centre to hold it all in place.