Roasted vegetables of all sorts are so tasty and easy to make - all you need is olive oil, salt, and pepper. You can add other spices too, like cumin, turmeric, garlic powder, etc. but you don't have to, the vegetables are fine on their own.
Try out some plant based protein - like the Yves products or tofu. I had never tried cooking tofu before, and although I'm still trying to find the perfect preparation method, it's great! It takes on any flavour you pair it with so it can be used in lots of places.
We add lentils or quinoa to salad bowls, or the Yves kale quinoa bites.
I use Michael Smith's salad rule when building these bowls - add something crunchy like nuts or seeds, something soft like feta cheese or avocado, and something chewy like dried cranberries. I usually make the dressing with some combination of olive oil, maple syrup or honey, tahini or dijon, vinegar or lemon juice, and salt and pepper.
And don't forget a good old soup and sandwich - a meatless meal that everyone can appreciate.