You could try the old school method - gallon of milk a day and go heavy on deadlifts and squats.

That ought to do it.

And quit trying to bulk on sugary shit. Eggs for breakfast, steak for lunch and fish for dinner.

Fellow hardgainer (low appetite pussy). I'm 6'4 215 pounds at ~15% bf. About 2.5 years ago I was 150 pounds before taking a shit. I can share what worked for me. Coolsocks said it best, but I'll get neurotic about it with you.

I would probably try to phase out the concept of "easy calories" because easy calories are generally just dirty foods, simple carbohydrates, or something retarded like drinking olive oil, and you need to be eating clean foods.

Instead I'd suggest an easier routine. What I used to do was slam as many calories as I could for breakfast because that's when my appetite is greatest. 6 egg omelette, 1.5 cups of old fashioned oats, and a can of diced pineapple. Takes about 10 minutes and it's ~1200 calories. I'd recommend you switch to old fashioned oats, they only take 2 minutes in the microwave, instant oatmeal is stupid. I'd recommend eating more eggs as they're easy to eat, and pineapple which is one the most calorie dense fruits. It's a carb heavy breakfast but it's fast and the rest of the day you can focus on protein.

1g of protein per pound of bodyweight is the gold standard, although from what I understand on a bulk, you actually don't need that much. Eat whatever meat you like the most, but be aware that lean meat obviously has less fat and therefore less calories. Can't go wrong with ground beef. 80% lean ground beef would probably give you most bang for your buck.

Protein shakes are awesome, whey protein is the most efficient source of protein you can easily buy, but you should be drinking them after the food, not before. Smoothies and that kind of stuff I'm sure is great but I never owned a blender.

Consistency is key, you can't have any days where you don't eat properly because of homeostasis. Your body will try to keep itself where it's at by burning excess. Consistency will make your body adapt, which includes your appetite. This was my biggest sticking point, had I really adhered to my plan and been disciplined, I would probably be 225 on on my way to a nice cut by now.

No need to overcomplicate this. Assuming you want to avoid unnecessary fat gain, you want to achieve a daily calorie surplus of a few hundred calories max.

You can literally add a protein shake with milk, per day to your diet, and your diet is set. Or 100g more of fatty meat. Doesnt matter.

I'm not a nutritionist , but you can quit the oatmeal and start having more starchy stuff like potatoes,or maybe some other carb like white rice,squash or sweet potatoes. Make carbs and fats your friends,eat em all through the day

MEAT. EAT MORE MEAT.

Instant Oatmeal = Sugar
Bagels = Sugar
PB = Sugar
Jam = Sugar
Potatoes = Sugar

Keep eating that junk and you'll gain the wrong kind of weight.
You want to take in more healthy fat. Lots of it. Get your body to burning fat and not sugar.

Breakfast: Eggs
Lunch: Eggs or a salad with olive oil/vinaigrette (not processed) dressing and chicken/salmon/steak
Dinner: Steak/chicken/salmon and Broccoli/Cauliflower/Green Beans/Asparagus

Like coolsocks said, burn less than you take in = gain weight, burn more than you take in = loose weight.

Why don't you do 5 smaller meals of high-density nutrients

Use cold pressed oils on all meats and dishes. Do a smoothie in the morning (oats, peanut butter, bananas, dehydrated coconut milk, protein, tapioca powder if need be) so it digests fast and is 700 calorie breakfast

Eat fast digesting lunches and dinners etc, white rice, sweet potatos, bananas, cold pressed oils (cold pressed only, no expeller pressed etc and only cold avocado and coconut oil, olive oil is okay but not as nutrient rich)

More high cal smoothies at night if need be

If you eat clean and break it into smaller but still sizey meals you will be hungry easy in 2-3 hours and won't feel full and won't be constipated and feeling like ass. When I eat clean I'm constantly fucking hungry even though the cal count is high

Consider if foods are FODMAP, those will take a while to digest (like cabbage, onions, etc). Fast digesting food will be your friend as they will break down fast. Ofc all that McDonald's was probably shit at digesting etc.

Edit:

bagels

Although this is a white grain, it's gonna be ass to digest. Lots of sugars and yeast. Your gut will bloat. Stick to clean shit that doesn't make you bloat at all