Where are you staying in Quito? If it's Old Town, that's not where most locals live. The Carolina neighborhood is a more "normal, regular" neighborhood. There is a mall across from the southwest corner of Carolina Park. It has a food court with lots of inexpensive and local dishes. There is a Republica of Cocao where you can get free samples of chocolates.
Visit the nearby MegaMaxi (like a Walmart) to see all the interesting fruits. Cleaner and you won't get ripped off here as in the mercados. Good place to buy coffee and cocoa to bring home.
On the "high-end" side is Zazu, the food is very good. Lunch tasting menu for two without drinks was $163. Inexpensive by American standards, especially if you have gone to French Laundry in California. They have a sister restaurant, ZFood, that specializes in seafood. Equally wonderful. These are not touristy restaurants, but filled with locals. There's also ZBar, which we did not go to.
If you come across a Cyrano bakery, try the beef empanadas. Their other products are really good too.
Just in case no one has told you yet, in both countries, do not drink the tap water. Carry some toilet paper with you. Put the TP into the can not into the bowl. The sun is very strong at high altitude. Bring hat, sunglasses, sunscreen, wear long sleeves shirts.
Have fun and enjoy.