Muesli is essentially a mix of flakes/oats and fruit and nuts. Apparently it can be mixed with more than just milk - like juices and red wine. I eat it with milk and like cereal, but you can also let the milk soak over night and eat it like porridge. I'm willing to try it at least once this way and at least once with orange juice (just so you know). Like granola, and like awesome things, you can mix it up however you like. Above is my mix. A base of oats and flakes, some crunchy, some chewy and some nutty.
I think muesli is easier to make than granola because you don't have to toast it if you don't want to, and you don't have to melt/combine/mix sugary, sticky things. Really, you could just mix ingredients and call it a day. But I do toast, a little. I toast the nuts, flakes and oats a smidgen. Just throw them on a tray into the oven at 300 and toast until golden like you'd like. I usually toast the coconut on a separate tray because it toasts much more quickly.
I start with 2 cups of rolled oats and eyeball everything from there, but usually it's about 3/4 to 1 cup each flakes, nuts, fruit and crunchies. It yields a fair amount, much more than you get in the $6 boxed kind at the store. Sometimes I change it up mid-week and add more nuts or more dried fruit (figs!).
I always have it with a scoop of plain yogurt, fresh fruit and milk. Crunchy, chewy, tart, creamy and sweet! Add some honey or agave if you prefer it sweeter. And that's it. Muesli.