Many places in Maspalomas are tourist traps which only counts on the heavy traffic their area already has (mainly in Yumbo and the beach promenade of Playa del Ingles) rather than on returning faithful customers, so those do not provide outstanding dishes.
However others are in the restaurant business because they are passionate about it. Here are some of the ones you can count on eating something delicious: Wapa Tapa (tapas), Kurry Kingdom (Indian), Lola (gastronomy), Fusion (Asian), Papis Grill, Green Planet (healthy), The Bistro (breakfast and desserts), Marhaba (Moroccan), 200 Gramos (Gran Canaria burgers), Hard Rock Cafe (American), Flor de Vainilla (desserts, coffee, breakfast), Holiday World Food Court (everything, from poke to Italian from Mexican to Italian, etc.) and many many more.
Google them. Check the reviews and photos of the dishes on Google Maps.
You can also check them on our site, here.
Note that most of them are available for order directly to you via the application Glovo and Uber Eats which you can download on the Apple Store and Google Play Store. (Mostly on Glovo). Come to the main entrance of the building to meet the delivery guy as soon as he/she arrives, otherwise tip him/her in the app or in cash (at least 1 or 2 EUR). More info here.
Also, if you want to try chains that are typically from Spain, there is 100 Montaditos which offers 100 different mini sandwiches for a super low price, the one in Maspalomas is located in the Tablero Mall. There is also Rincon del Pan, which is a sort of Spanish version of a mix of Starbucks and a bakery, with all sorts of very tasty desserts, breads, sandwiches, hot beverages and juices (ideal breakfast place or to meet up for coffee). However at this time, the 7 Gran Canaria ones are all located in the North of the island in Las Palmas.