Can't get enough calories

I know tracking is not highly encouraged. Nor is scale weight. However after 2 years of doing neither I've lost progress. Scale is up 10lbs from starting weight and I simply look and feel crummy lately.

Anyhow I am back tracking returning to logging food and exercise to keep myself accountable.

I know I burn between 2100 and 2700 calories each day. So I'm trying to stay around 1800-2000 intake.

Logging ahead I can't get over 1600 and its a lot of food.

What are some quick simple snack ideas I can add? I am vegetarian, but will eat egg and some seafood.