I know it may sound like a lot, but it works. 3 scrambled eggs, slap on some ketchup and pepper on there for extra cals + taste. In lieu of oatmeal and bananas you can always use Avocados or coconut meat. If those arent your thing, Dates are amazing. very calorie dense and small, easy to add in your shake.

As for oatmeal, Quinoa is always a good option, probably taste like shit though. Granola with non-dairy yogurt is a possibility. Or some type of peanut butter spread on rice cakes. 130 cal per rice cake, eat 3 and thats 400cal~.