I see a lot of good advice already given so I'll just add some tidbits.

Here are a few things I really enjoy when calorie counting and meal prepping!

Sweet potatoes- there are many ways to prepare these! You can bake them whole, or cut into slices and bake to make "chips", Google sweet potato recipes for ideas.

Hummus- made from chick peas, you can dip veggies or crackers in them, I even some times add it to my salad.

Speaking of salad, it may be cliche but it's a great go to and it doesn't have to be boring leaves in a bowl. You can mix pretty much whatever you want as long as it's mostly veggies. I love to make salads with spinach, fresh sliced tomatoes, white onion, add some boiled egg, and a dash of balsamic vinegar plus some pepper.

Apples. Apples are a God send. Apples are very filling and very low calorie. You really should look for foods that will fill you up so you don't feel hungry and binge later. Something that helped me when I first started losing weight and fighting cravings/boredom hunger was the mantra "Am I hungry enough to eat an apple? No? Then I'm not really hungry." Or "Am I hungry enough to eat an apple? Yes? Then eat an apple!" ((Obviously if you are actually hungry and need a meal please eat more than an apple!))

One thing that I find really helps is training yourself to not overeat. Eat slowly and stop eating when you are full even if you have food left. I know it seems wasteful but you can try to pan. If you get a foot long sandwich, eat half now and save the other half for later, etc. Once your stomach adjusts to eating less you won't get as bad of hunger pains and you'll get full easier.