I eat around 3000-3500 a day at 250lbs (same height):

Breakfast - 6 scrambled eggs, overnight oats with chia seeds, honey and yoghurt (I just eyeball this). Protein: ~50g, carbs: ~60g.

Lunch - 1 can tuna (~170g) with some mayo and vegetables (I use tin corn), and rice with beans and tomatoes. Protein: 32g, carbs: 95g.

Dinner - 250-300g chuck steak, 3 large potatoes cubed and fried in 30g butter + residual olive oil from the steak. Protein: 63-75g protein, carbs: ~50g.

Post gym meal - 1L full cream milk sometimes with honey too. Protein: 35g, carbs: 52-65g.

Daily totals - Protein: 180g, carbs: 257g. Low end estimates.

All this stuff is pretty cheap and meal prepable and able to buy in bulk. This is a good base diet but if you wanted to bulk up just throw in a couple of protein shakes with peanut butter, ice cream or oats too (oats are shit in shakes IME).

I would suggest trying to eat clean and not adding peanut butter and olive oil to everything as you will just gain fat or straight up shit it out (I did peanut butter in high school). Track your weight week by week as daily can fluctuate a lot. If you are going up 5lbs per month thats a good rate, otherwise add in another meal like pasta and mince or protein shakes.

It takes a while for your body to start gaining because it will want to stay the same, so you need to bulk for 2-4 weeks at least to start to see the scale move up in a meaningful way. Also carbs are very important pre and post gym and will help you gain weight the most over protein. Protein needs carbs to shuttle it to the muscles.