Change the way I eat in the morning

There's no rule that says you must eat at any certain time. If your goal is simply to gain weight, then add calories into other meals. No matter what your goal is, it's all about finding what works for you, not what works for someone else. So, I would maybe try having something small with your morning tea then having breakfast later and see how it works. If it doesn't try something else.

A protein shake may be a good option. Or something like toast with nut butter on it, since nut butter can pack quite the calorie punch. Otherwise, I would keep doing what you're doing and just try to bulk up your other meals so you're getting in all the calories you need.

Eating lots in the morning is something a lot of people struggle with, as long as you hit your macro mark at the end of the day you're good to go. Like mentioned before, on a higher calorie diet it might be tough to hit that target if you don't eat much in the AM. I typically have a protein shake first thing upon waking with additional Creatine and glutamine mixed in. Then I'll have my breakfast, typically always 1 cup oatmeal, eggs, or Greek yogurt topped with organic maple sugar, and some fruit. Then I'll wait half hour or hour and go train! :-)