3 tsp of cinnamon? That's a ton of cinnamon, even if you're dividing into 4 servings. That would be overpowering for me. I just do a few dashes of it on mine.
But yeah, I've been doing overnight oats for a solid 3 years. Super easy, saves me time, and I find it tasty. Also think it's healthy for me. Try to have it post workout since it's got protein powder in it. I also eat it cold, and like it like that from a taste and texture perspective. If you want to have it warm, don't over cook it, as it can sometimes form a layer on top (almost like a baked product) if you protein powder and stuff in it.
My almost daily go to is as follows (I weigh all my ingredients for consistency):
40g old fashioned rolled oats
1 scoop vanilla protein powder (enough for ~20-25g protein)
10g milled flax seed
5g hemp hearts
15g almond butter
200-220ml whole milk or soy milk (or some combo of the 2, though soy milk will be thicker, so combine with water if just soy)
80g frozen wild blueberries
A few sprinkles cinnamon on top
Sometimes I'll add other things into it overnight, like various nuts, chopped dates, drizzle honey.
Sometimes I'll add other stuff the morning of eating, like fresh strawberries, honey, dates, peaches, or other berries
The consistency I go for is like almost soggy cereal without a bunch of extra milk, if that makes sense. It might take a few tries to get the exact texture you like.