At build your own salad or grain bowl places like Sweet Green or Dig In it's easy to skip the meat and dairy. I like ordering Sweet Green's shroomami or harvest bowl, removing the cheese, and adding lentils, sweet potatoes, and avocado. I always swap the dressing in for their vegan spicy cashew dressing.
Chipotle is probably my favorite plant based takeout place. Brown rice bowl (or swap for cauliflower rice), with sofritas, beans, roasted vegetables, salsa, corn, guac, lettuce. You could also swap the bowl for a burrito wrap or taco shell. They also have build your own kid's meals here which I love. If you don't have a Chipotle near you any Mexican place usually has beans, veggies, rice, and guac available for an easy veggie taco.
I love Bertucci's roasted vegetable pizza pictured here (without cheese) because of the garlic oil they put on it. But pile veggies on from any pizza place and then if you want, melt vegan cheese like this in the oven for 5 min when you get it at home. Pasta pomodoro (marina sauce) and a side salad will usually always be available at an Italian place, I often ask if they can add sautéed veggies (like zucchini, mushrooms, onions) to my pasta. Homemade pasta has always been easier on my stomach than a refined flour box pasta.
Yellow or Panang curries with vegetables, pineapple, and tofu with a side of brown rice are my favorite when ordering thai food. Drunken noodles or vegetable pad thai is also a common order of mine. Thai food is very vegetarian friendly so their menus usually offer many options. Good thai food in your area might take some trial and error but it's worth it once you find a good spot.
Dahls and dishes like Aloo gobi are easy filling vegetarian meals because they are made with creamy lentils or chickpeas served over rice. If you like food with a lot of spices Indian is a great option.
For the impossible whopper or plant based nuggets. Many other fast food chains are doing this using beyond meat, impossible, or just egg products,in select locations like KFC, McDonalds, Dunkin Donuts, and Starbucks- just check your local menu before you go.
If you are skipping on fish, sushi places usually have vegetarian rolls (tempura sweet potato is my favorite) on their menu and if not, it's easy to ask for avocado instead of crab in your california roll. Japanese food, like thai food, also traditionally leans towards plant based so most times the menu will include noodle and rice dishes that are also vegan/vegetarian. I love miso soup and seaweed salad alongside my orer.
If you are ordering from a restaurant without any vegetarian options try ordering a few sides like roasted sweet potatoes, brussels sprouts, roasted veggies, and rice. You could pile all of them together or on top of a plain pasta dish. A little olive oil and s&p and you have a plant based meal.
Tips: Typing in "vegan restaurants" to my google maps has always found me success. Or download the happy cow app to tell you restaurants with vegan/vegetarian restaurants near you.