Looking for breakfast ideas

I think I'm ready to give vegan a try, but I'm struggling with breakfast ideas. Mostly I'd meal prep egg and bacon burritos or just have some toast with jam.

I used to be a cereal person but after having my gallbladder removed I developed an intolerance to lactose. And I haven't found any good alternatives for milk or cheese that I like, so I've basically cut them out of my diet. Plus most cereal is loaded with sugar, and...

I found out yesterday that I'm prediabetic and my cholesterol is a little high. So, I'm trying to move away from animal products and sugar.

I will occasionally have toast with peanut butter and banana on it, but that's so calorie dense, I only eat it on days I know I'll be doing a lot of physical activities. Most days I sit at a desk for 8-10 hours.

So really the only other thing I can think of is oatmeal. And eating a bowl full of something hot is the last thing I want to do after my morning walk. I'm in Texas so it's hot even when I go out at 5 AM.

I'm looking for ideas that can, preferably, be meal prepped or take less than 5 minutes to make. But I'm open to any ideas. Thanks!