I never did well with cereal and milk for breakfast. I needed 2 or 3 bowls to feel full, and it didn't stick.
I'm fond of oatmeal for breakfast, but it has to be good oatmeal. I like the extra thick oats (and dislike the instant oats). I like some chew and texture. I cook this on the stovetop on Sunday so I can have it ready to reheat M-F.
In the summer, I was having it with fruit in it. Mmmmm, peach & cinnamon. Now I'm cooking it with a can of pumpkin, some pumpkin pie spice, 1/2T of molasses, and a zested orange. Then I reheat in the morning with some soymilk, and then add 2T ground flaxseed. Wow, do I feel impressed with myself for having veggies for breakfast
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For a morning snack, I have some variation of yogurt (Greek, plain), with fruit and some granola. My fallback is yogurt, blueberries and some banana, and granola. That's a really yummy parfait. But I try other combinations too.
I'm not adding sugar to any of this (except the 1/2T molasses in the oats, that's spread over 5 servings). I rather like not sweet. The fruit adds sweetness, especially banana and wild blueberries (the small wild ones are sweeter than the bigger ones), and the granola is actually too sweet for my liking, so it also sweetens the yogurt.
A boiled egg can be a tasty midmorning snack, or addition to breakfast if it was small & lacking protein.
You may find, after a sound breakfast becomes a real habit, that the inclination to have fast food for dinner lessens.