Our reviewer was sent a sample of the Ninja 12-in-1 Double Oven with FlexDoor to the test in her kitchen. Keep reading for our product review.
Chances are you already have a full-size oven (or two) in your home and there is a high probability that it doesn’t get used much during the week. Mine doesn’t. I try to skirt away from it until I really need it, like when I am meal prepping for the whole week or baking multiple loaves of bread at the same time.
For everyday use, I am a fan of countertop ovens and air fryers that preheat quickly and can cook relatively small portions of food, as well as larger family meals. Having loved and used the smaller ovens for several years, I must say that my expectations were quite high when I began testing the Ninja Double Oven with FlexDoor. But here I am roasting a whole chicken with garlic for dinner and baking a custard, at the same time, not in the least concerned that the custard will taste like garlic or chicken!
Ovens sync to finish cooking at the same time
Flavors do not cross over
Condensation on doors
Trays are not dishwasher safe
The best feature of this oven is the “Smart Finish.” This was how I could roast chicken in the bottom oven and vegetables in the top, and have them finish cooking at the same time! The oven will begin cooking one part of the meal, while having a delayed start for the food that requires less time. Once the finishing times are in sync, the oven starts to cook the food that was on hold. The syncing of the two ovens essentially freed up my time as I prepped everything, loaded the oven, set up the temperatures, and walked away!
Another neat thing about this oven is the FlexDoor. This creates two separate ovens as the top of the oven door can open partially for access to the top part of the oven or it opens fully for full access to the entire oven. I loved cooking appetizers or snacks in the top oven while cooking the main meals in the bottom.
The Ninja double oven is loaded with features for air frying, roasting, convection bake, dehydrate, reheat, and broil among a few others. Based on the functions you choose the Ninja activates the heating elements and distributes the appropriate amount of air flow inside the chamber. The convection bake can get to 450 degrees Fahrenheit, which is more than enough heat for everyday cooking and baking, breads included.
The air frying function is a game changer. I was able to cook close to two pounds of French fries in one go, and all cooked to a crisp and golden perfection. I was afraid frozen foods might turn soggy, but I had excellent results with frozen fries, onion rings, and even mozzarella sticks. Entertaining a bunch of teens also got easier since the pizza function worked like a charm on frozen pizza while the top oven produced a huge tray of sheet-pan nachos.
Capacity and Flavorseal
Most air fryers and countertop ovens disappoint when cooking larger quantities. Food is either soggy, unevenly cooked, or there isn’t enough room to cook more quantities. But not so with the Ninja! I was impressed with how it cooked large quantities of frozen and fresh foods. I was able to roast an almost 4-pound whole chicken along with vegetables to feed six people for dinner. Chicken wings for a party? Easily done.
Another thing to note is that although it appears that most of the food is cooking near each other, the flavors do not transfer. I made a delicate custard for crème brûlée while baking fish. The aromas wafted around in the kitchen, but the dishes themselves remained true to their flavor profiles. There was no flavor or aroma transfer between the two!
One final note…
For busy families, the Ninja Double Oven with FlexDoor is a solid option to cook multiple meals that cater to varied tastes and nutritional needs—and you'll have time left over for that second bedtime story.
Price at time of publish: $330
Buy this, now.
The Ninja double oven is efficient and versatile. From cooking everyday meals to catering to friends and family for big parties, this oven handles it all.
Product Name: Ninja 12-in-1 Double Oven with FlexDoor
Product Brand: Ninja
Dimensions: 18.6 x 16.39 x 13.26 inches
Power: 1800 watts
Weight: 31 pounds
Warranty: 1-year limited
What’s Included: 2 Sheet pans, 2 wire racks, air fry basket, crumb tray, recipe guide
Why Trust The Spruce Eats?
Renu Dhar is a personal chef and culinary instructor who is passionate about making cooking approachable, developing easy and nutritious recipes, and finding tools that help make cooking fun and easy for everyone. She integrates her professional kitchen expertise, knowledge of ingredients and world cuisine to research and write for The Spruce Eats.