Taco Temple - it's on Charlotte St. slightly north of downtown. Owned by the same people who run the popular Mamacitas Tacos downtown, this place is slightly more upscale, but still down home enough. They make their own tortillas, have a bar, and really interesting tacos and even a great salad.
Rosetta's - Vegetarian fare reminiscent of the 80's hippy food restaurants, you can go to the counter and order a Buddha Bowl (rice with their amazing peanut sauce, avocado, marinated tempeh, greens, seaweed) for under $10 and either sit inside or take with you. Quick and yummy.
Roman's - Great sandwiches right near the Pack Library downtown on Haywood St. They will even deliver to your door. Especially good is their grilled chicken salad sandwich.
Taco Billy - man oh man this place is great! It's on Haywood St in West Asheville (the "other" Haywood st). and has a walk up counter as well. Take my advice and get Mama's taco substituting avocado for the sausage on their plantain tortilla, and don't forget a side of their delicious green tomatillo salsa and chips. So, so good - and inexpensive.
OWL Bakery - just around the corner from Taco Billy in W. Asheville, this cute little bakery has some of the best bread and pastries in town as well as quiche and other tartines for a quick light-ish lunch. Or go to Taco Billy and then get your dessert pastry. But, oh my, you have to drive right by the now nationally famous Hole donut shop - might need to stop off there too. What a delectable corner that is in W. ASheville!
Gan Shan - well this isn't quick, but man is it good. Also on Charlotte St. just north of downtown, get their rice bowl with black bean chicken and you'll be a happy one. They are soon to open another place on that same delicious corner in West Asheville.