Cut your batting and denim squares to the same size. You don’t need backing fabric yet as this block is designed for the false backing quilt-as-you-go method.
You need one strip per block. I love mixing quilting cotton with denim, it gives a great pop of color and a different texture.
Quilt 3-4 evenly spaced lines through both the denim and batting. We add the scraps later! I used a 12wt variegated thread and a 4.0 stitch length.