There's a lot of options near the Valencia Town Center mall. I personally enjoy Pei Wei, Pick Up Sticks, Islands, Presto Pasta, Stonefire Grill, Topper's Pizza, Chop Shop (custom salads), Cafe Rio (a Chipotle-style place), and Zanku Chicken (an local LA fave). There's also a Crumbl, and if you're willing to spend a bit more money and time, Gyu-Kaku is really good grill it yourself Japanese BBQ.
Behind the park in the other direction (more to the north) is Jimmy Dean, a fast food greasy spoon with a little bit of everything (burgers, chicken, salads, Mexican). Next to that is Tommy's known for really good, greasy chili burgers that are also an LA fave. And if you're looking for unique local history, can't go wrong with Saugus Cafe, which is the oldest restaurant in Los Angeles--130+ years! It's said that President Benjamin Harris dined there is 1890, and Theodore Roservelt in 1903. It's a classic coffee shop diner.
On a side note, SFMM (and others have also reported) that Goliath is now back open.