That's why I bought a Cricut!
Use Heat n Bond Ultra. Iron to 100% cotton fabric, about 3-4 seconds for each press of the iron (no steam). Peel off the paper. Place the fabric side up on the sticky mat. Use a brayer or roller to press firmly onto the mat.
Set the machine to low speed, max pressure, and the blade at 4. For thicker fabrics, multiple pass option may be necessary.
Works great! My first attempt was making the cutest snowflakes using the Winter Lace cartridge and white fusions fabric. I was hooked!