I've been making my own breakfast cereals lately. I like store bought kinds, but they tend to be filled with sugar and cheap ingredients. Muesli is great because it's a cold cereal that you can eat with milk as you would with any store bought kind, and it's easy and inexpensive to make at home. I made mine in a 1/2 gallon mason jar that I rolled around on the carpet to mix.
3 C oats
2 C whole grain or corn flakes
1 C raisins
1 C slivered almonds or nuts
1/4 C sesame seeds
1 t cinnamon
dried fruit (I dehydrated apples and berries this summer.)
other possible additions- barley flakes or any flaked grain, cardamom, cacao nibs, powdered ginger, pumpkin seeds
This is great with homemade almond milk.
You can cook steel cut oats in a Crockpot! I like them a lot, but the make a mess when they boil over on the stove top. With the slow cooker you turn it on before you go to bed and in the morning you have breakfast waiting for you. They don't boil over either.
1 C steel cut oats
4 C water
cook on low for 8 hours
flavorings: raisins, cinnamon, brown sugar
I also like to add strained almond pulp from making almond milk. (I freeze it to be used later.)
If you live in Portland Bob's Red Mill Store is a great resource. I bought whole oat groats (the entire grain, not cut into pieces or rolled) there which were great in the slow cooker.