Definitely check out some other flavouring methods. Huel is more nutrient dense/varied than the oat choc milk and banana so you’ll be adding a fair few additional calories. No problem if you’re monitoring calorie intake. But I guess if you can find a mix that works for you without having to add extras then you’ll be getting more nutrients in pro-rata. Our Flavour Boosts are great (shameless self promo), but yeah cacao powder is a popular one, adding coffee is great (fresh or instant).
This thread is pretty vintage but has some great suggestions in: