Okay, Danielle, I've got a couple of quick dinners that come to my mind, but I'm almost embarrassed to post them because they aren't very exciting/creative. But, they both take less than 30 minutes, without being spaghetti, so here you go:
1. Taco plate/taco salad... whatever you want to call it:
1/2 - 1 pound hamburger (whatever your preference)
1 can drained kidney beans
1 can semi-drained pork and beans (I know, sounds lame, but I think it works. If you don't stock your cupboards with pork and beans though, it's not a vital ingredient)
1-2 can tomato sauce (I use 1, if you like it more tomato-y, you may want more)
taco seasoning to your liking (I usually use about 1/2 a packet)
Brown burger, salt and pepper it, add all other ingredients and simmer a bit. We usually eat ours like this: layer of tortilla chips, meat, cheese, lettuce, ranch, etc... whatever you like on a taco salad.
2. Chicken and black bean quesadillas:
1-2 chicken breasts, cut up
1/2 - 1 can of drained/rinsed black beans
1 can green chillies
taco seasoning to your liking
Cook chicken completely in a little oil with salt and pepper, add the rest of the ingredients and heat through. Make quesadillas: tortilla, cheese, chicken, cheese, tortilla. Serve with sour cream, guacamole, salsa... whatever you like. I also like to use this for a taco salad for yet another change.