I think it's disordered eating, or at least on the path that way, especially as you're asking if it would be an average day and seem to think it's normal to eat like that, when it's obviously not.
Almost no fruit and veg
Mostly rubbish carbs, little nutrition/protein
4 meals and a very substantial snack of (a whole tub of?) brownie bites.
I couldn't eat that much so wouldn't even try and I'm far from a MN teeny tiny protein and veg advocate. Yesterday I had a medium sized frozen pizza for brunch and went to McDonalds at 4 pm where I had a fish filet, medium fries and an apple pie after a 6 mile hike. Apart from a G&T in the evening, that was everything I consumed that day (probably around 2000 calories or so, so while far from ideal, not 'disastrous' from a weight control point of view). I don't normally eat like that and am trying to eat better, and am usually succeeding, so yesterday wasn't typical for me.
Do you eat eggs? They're very quick to prepare and filling and nutritious and might help you get off the carb rollercoaster. Make an omelette for breakfast, probably quicker than waiting for the toaster.
Or beans on toast with just one or two slices, preferably wholemeal bread. Sprinkle a bit of grated cheese on for extra flavour.
Put mince or a tin of green lentils if you don't eat meat in your pasta sauce, or a can of tuna. Little extra effort and adds protein/nutrition. Also a grated courgette which will cook into the sauce.
If you swapped the 16 brownie bites for a can of rice pudding, it would be fewer calories, less sugar, more filling and slightly more nutritious, but still quick, easy and snacky.
Will you eat absolutely no fruit and veg? Even if it is frozen, canned or prepared? What about stir fries with the 'meal kits' of protein, stir fry veg, noodles and sauce? Very quick, low effort, and much better than what you're currently eating.
So perhaps try some 'baby steps' such as the above suggestions if it's not realistic that you'll be living off steamed fish and spinach and once you're used to that, you can try and further improve your diet and health.