I have done this a few times. There are a number of methods, I usually use strips on both front and back. Leah Day has a video on this method. Did it once with sashing. Used the sashing as my strips and cut a narrow strip of batting to lay in the channel made by the sashing. That's a little tricky. You could do the sashing as if a block and use the same fabric for the strips on either side of the sashing. You could even use a contrast fabric for the strips to make it look as if the sashing were pieced.