Is too hard to eat!!

To be honest… you didn't get to 270 lbs by eating 1000-1200 calories a day. You got there by eating well over 1500 calories. You did it once, you can do it again.

Eat calorie dense foods like nuts, seeds, nut butters, avocados, olive oil, coconut oil, ice cream, etc.

Well, first and foremost I should probably suggest you check with your doctor if you're truly unable to eat 1500 calories.

Calorie dense foods can be your friends when you're trying to boost your calories. This is a generic list and it's definitely not comprehensive, but anything here can be included in a balanced diet (as long as there are no allergies, medical conditions, obviously):
avocado
cheese
full fat dairy
Greek yogurt
ice cream
peanut butter (or other nut butters)
dark chocolate
less lean cuts of meat (including beef, pork, sausage, etc.)
seeds (chia, flax, sunflower, etc.)
nuts
olive oil
coconut oil
butter
beans and lentils
protein shakes, bars, and smoothies
hummus
beef jerky
cornbread
tuna
full calorie condiments
full calorie sauces & dressings
sour cream
guacamole
whole grain pasta
rice
bacon
whole eggs
quinoa
fruit and fruit juices
pretzels
bananas
scones
muffins (bran, blueberry, banana nut, etc.)
potatoes (sweet, red, gold, purple, white, etc.)
dried fruit (raisins, apricots, plums, dates, etc.)
granola
coconut
salmon
edamame
honey
molasses

I'm guessing you just need to expand your definition of healthy. A lot of people get a little too gung ho in the beginning and think that anything with fat or carbs is "bad" and so they have trouble eating enough. Try adding things like avocado, olives, nuts/nut butters, potatoes, fatty cuts of meat, etc. Fat has more calories per gram than carbs or protein, so you get more calories for less food.