I make a vegetable soup that is chicken stock, diced tomatoes and whatever canned or fresh vegetables I have/want. I usually dice a potato in it. I like to sweat a lot of the vegetables in olive oil before adding the liquids. Add italian seasoning for flavor and soy sauce, Worcestershire sauce, fish sauce, and/or marmite for umami so it feels meatier. I also add crushed red pepper or hot sauce. It's nice because it's warm, flavorful and I can eat almost as much as I want considering how low calorie it is.
I love zucchini pasta with a fresh tomato basil sauce. Zucchini has about a tenth the calories as normal noodles. I find the vegetti redundant though. If you have a mandoline with julienne or matchstick attachment you can use that. If not I just use a vegetable peeler to get wide flat noodles. They only take about 2 minutes in boiling water to be perfect. Since this is so low calorie you can have a lot of it or add grilled chicken or meatballs and still be good.
Stir Fry is also your friend. It cooks quick and is a great way to get lean protein and vegetables. Just look at the calories in the sauce you add. That's the only dangerous part. That and the rice. If you need a starch to go with it go with soba noodles. They have about half the calories of rice, though as long as you don't eat too much of it rice isn't bad.
Berries make a great snack. Strawberries are delicious and you can eat an entire pint package which is only about 116 calories. It's hard to find such tasty snacks that are that low.
I'll also eat sliced apples and peanut butter for a snack because the peanut butter makes it so filling.
Salads are an easy suggestion. Add steak or grilled chicken to basically any salad to make it feel more like a meal and less like punishment. Taco salads with romaine, tomatoes, black beans, red peppers, chicken rubbed with taco seasoning, avocado, and salsa as the dressing feels like a cheat meal but isn't.
Fish is another great lean protein with fish oils/omega 3. I personally can't stand fish so I can't give any specifics.
Now if only I could follow my own advice I'd be healthy.