There are many great 30 minute meals you can cook without resorting to what I've done for dinner tonight, frozen Stouffer's lasagna and garlic bread. While that sounds good, it's not a home-cooked meal, which is always going to be more affordable and more delicious. There are many great unique dishes you can make, like penne with shrimp, thirty minute chili, grilled salmon, fish tacos and coconut shrimp.  Those are just some of the many dishes out there that can really provide you with diversity in your meals regardless of not having much time to cook.
One recipe that I found that really stood out to me was for Black Bean Burritos. I love Mexican food, and at first glance, I knew this was Mexican food with a Caribbean twist, one of my favorites. This is a 30 minute dish, so it's going to be simple yet delicious. You cream cheese, onions, bell pepper, fresh cilantro, black beans, jalapenos and hamburger meat is actually optional. You can enjoy this as a delicious vegetarian burrito or even a chimichanga, which means you would fry it up in the pan instead of having the tortillas on the side. 
If you decide to eat it as a regular burrito, you are going to quickly sautee the onions, bell peppers and jalapenos, then adding in your black beans, fresh cilantro and cream cheese. The hamburger meat if you choose to have it can be working on the side in another pan. That's all that this recipe requires, and all you have to do is to stuff a tortilla and enjoy.
I also want to make mention of salads, as these are quick creations that have many variations thanks to so many great salad toppings and dressing choices. There is a great recipe for Crunchy Carrot, Chicken & Pea Salad that calls for ciabatta croutons, olive oil, garlic cloves, salt n pepper, chicken, romaine lettuce, peas and mustard chive vinaigrette dressing or another dressing of your choice. You can add a few other ingredients in there to make it your own, but this is a recipe brought to you by Country Living Magazine.  Any salad that you decide to make would easily be a 30 minute recipe and can be made in bulk for a large family in a salad bowl.