Easy Sheet Pan Steak Fajitas in the Oven

Sheet pan steak fajitas are yummy and a quick meal for your family tonight. A keto low carb dinner packed with flavor and vegetables it’s sure to become a fave. Use the best fajita marinade ever on your meat, then bake in the oven and WOW!

How to Cook Marinated Beef Fajitas in the Oven

We have made these several different ways, you choose which one is your favorite. If it is hot outside and you don’t want to use your oven for this version you can try our Instant Pot fajitas. 

BUT the “old fashioned” oven is still a fave among many so we wanted to offer this way too. All of them have lots of vegetables mixed in but this one has the most, including potatoes! You can leave those out to be more keto friendly if you like, or just let the kiddos enjoy them.

How long to cook fajitas in the oven at 400 degrees

You would need to double the time to about 10 minutes in this case if you didn’t want to use the broil setting as directed below. Cook time will vary depending on the size and thickness of the strips so you will want to test often.

Low carb lunches such as this one are great. They’re packed with protein to keep you full, but not shy on flavor. 

There are many ways to season your meat. For a simple sprinkle you can just add a little salt and pepper. If you want to go beyond that we have a light dry rub for beef below. Then marinade overnight and then continue on to finish the recipe as directed.

With any of these options comes the heat factor. We prefer ours to be in the mild/medium range but you can really pack on the spices if you’re daring. 😉

You can rub on our steak dry rub first if you want bold flavors or use our marinade. There are bottled sauces you can use instead as well. You will need rimmed baking sheet, a small bowl to add meat and marinade

Ingredients

1. Flank steak sliced into thin strips
2. Broccoli
3. Small potatoes
4. Bell peppers and onions
5. Mushrooms
6. Olive oil
7. Seasoned salt
8. Cumin
9. Oregano
10. Garlic and garlic powder is optional
11. Sriracha seasoning is great for heat

You can buy a premixed fajita seasoning or this is how to make fajita seasoning yourself. Then you can make flank steak fajitas in the oven.

Best Way to Cook Fajitas in the Oven

1. Pre-cook your potatoes, either by boiling them for 15 minutes, or by poking holes in the skins with a fork and microwaving for 7 – 10 minutes.
2. Grease a large sheet pan sprayed with cooking spray. Slice cooked potatoes in half, place cut side down on sheet pan.
3. In a large bowl, toss broccoli with 2 tbs soy sauce and 1 tbs olive oil. Lay them on top.
4. Slice peppers and arrange on sheet pan. Spray lightly with oil. Arrange mushrooms on sheet pan, spray lightly with oil and then sprinkle with seasoned salt.
5. Arrange onion slices on sheet pan, spray lightly with oil and season with chili powder, cumin, seasoned salt and any others you like.
6. Slice your meat into small slices. (this is how to cook frozen steak separately) In a large bowl toss with 1 tbs olive oil, 1 tsp cumin, 1 tsp minced garlic (about 1 clove), 1/2 tsp oregano, 1/4 tsp salt.
7. Spread onto your sheet pan in a single layer.
8. Cook under a high broiler for 5-7 minutes, then flip steak and onions. Cook another 5-7 minutes or just until meat is cooked.
9. Pay attention to where your broiler is mine is always hottest in the center, so I put more hearty items in the center of the pan.

If you want to make sheet pan chicken fajitas you could follow this recipe too, you just may need to adjust time to a bit less and ensure chicken is cooked through before consuming.

Just use boneless skinless chicken breasts and cut into thin strips, marinate and add chicken and vegetables to sheet pan as directed.

Can you use chicken instead of steak?

You could add strips of chicken too alternatively. Either way warm tortillas on the stovetop or microwave and serve with meat and vegetables inside. Or just eat as is or served on top of a bed of Instant Pot white rice for a gluten free option. Total cook and prep time should be around 30 minutes from start to finish. 

What’s great about these sheet pan steak fajitas is there are so many options when it comes to a dry rub or beef marinade. Use your own secret recipe if you have one, or use ours. When you’re using beef you can also make it as “well done” or rare as you want. 

What goes with fajitas?

• Sautéed or caramelized onions
• Cloves of garlic
• Peppers, any and all colors
• Chicken (or steak)
• Serve it with:
  • white rice or brown rice
  • beans, pinto or black
  • tortillas, corn or flour
  • sour cream
  • guacamole or slices of avocado
  • Cheese is a must for us, I love Jack and sharp cheddar

How are you supposed to eat fajitas?

There isn’t a wrong way really!! Think outside of the box and make a steak fajita cups as an appetizer that is easy to grab and go for parties. Top with a bit of pico de gallo and they are always a big hit.

• If you’re having people over and want a hearty meal but easier to pick up these are the answer!
• I showed you a picture of our crockpot chicken fajitas above. Great if you’re out and about all day.

Prefer fish? Try these shrimp fajitas some night too. And we’ve even made beef and shrimp air fryer fajitas! Jump to recipe below and get started with our easy sheet pan steak fajitas recipe.

What makes a fajita a fajita?

Traditionally they’re served sizzling hot using skirt steak! They’re a Tex-Mex cuisine made with any grilled meat that is served as a taco on a flour or corn tortilla.  Love making meals this way? Try our sheet pan chicken thighs and sheet pan turkey next!

Line the pan with foil before you begin, and cleanup will be a breeze!