Sheet pan steak fajitas cook peppers and onion first, then add thin flank steak strips for a shorter final roast. Two rimmed trays keep the vegetables spread out instead of piling everything into one crowded pan.
The oil and fajita seasoning are divided equally between vegetables and beef. Slice steak across the grain before cooking, and check thicker strips lengthwise with a thermometer rather than relying on their surface color.
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Why Vegetables Roast Before the Beef
Peppers and onion need more time to soften than thin beef strips. Giving them a head start avoids extending the steak roast just to finish the vegetables.
Two large sheets offer room for evaporation. A deep pile traps moisture and can leave the mixture steaming in juices rather than roasting in an even layer.
Seasoning each component separately distributes the oil and spice mixture without overworking raw meat among prepared vegetables. A short rest after the beef reaches temperature completes the serving stage.
Ingredients for Sheet Pan Steak Fajitas
Filling
- 1 pound flank steak (Acrossgrain;1/2 inch strips)
- 1 tablespoon lime juice
- 1/4 cup olive oil (2 Tbmeat+2 Tbvegetables)
- 3 tablespoons salt-containing fajita seasoning (Halfmeat/halfvegetables)
- 1 medium yellow onion (1/2 inch strips)
- 1 medium red bell pepper (1/2 inch strips)
- 1 medium green bell pepper (1/2 inch strips)
- 1 medium yellow bell pepper (1/2 inch strips)
- 1/2 teaspoon black pepper
Flank steak: Cut across the grain into half inch strips so the finished pieces are easier to bite.
Olive oil: The quarter cup equals four tablespoons: two for vegetables and two for steak.
Fajita seasoning: Split the three tablespoons equally, with 1 1/2 tablespoons for each component.
Vegetables: Keep onion and all three pepper colors near the same half inch strip size.
Lime: The measured juice coats the steak; no additional marinade liquid is listed.
How to Make Sheet Pan Steak Fajitas
- Prepare vegetables. Heat the oven to 400 degrees F and line two 18 by 13 inch rimmed sheets with foil. Toss sliced vegetables with two tablespoons oil, half the seasoning and black pepper.
- Start the roast. Spread vegetables across both trays and roast 12 to 15 minutes. Meanwhile slice steak across the grain and coat with lime, remaining oil and seasoning. Keep refrigerated until it goes into the oven.
- Add steak strips. Make spaces among partially cooked vegetables and lay beef without overlap. Roast another 8 to 12 minutes, turning once, until thick strips reach 145 degrees F. Insert the probe lengthwise to reach their centers.
- Rest and portion. Rest the filling 3 minutes, then combine with clean tongs and divide into four portions. Tortillas or rice are separate accompaniments, not included in this filling yield.
Serving the Roasted Fajita Filling
For whole steak cooked before slicing, compare grilled steak fajitas or skillet steak fajitas.
A side of creamed corn complements the roasted vegetables. For chicken in a different pan method, see one pan fajita chicken.
Storage and Reheating
Refrigerate shallow portions within 2 hours, or 1 hour above 90 degrees F. Keep at 40 degrees F or below for 3 to 4 days. Store the filling separately from any tortillas so they do not absorb the juices.
Freeze cooked filling for up to 2 months for quality and thaw in the refrigerator. Reheat gently in a skillet or covered in a microwave to 165 degrees F throughout. The reheated beef will be more cooked than the freshly roasted strips, so warm only the portions needed.
Tips and Substitutions
- Use both large sheets. The intended spread depends on two 18 by 13 inch trays.
- Give vegetables their head start. Adding beef from the beginning changes its cooking time.
- Split oil correctly. A quarter cup is four tablespoons total, not four per component.
- Split seasoning equally. Set aside the beef half before handling raw meat.
- Avoid overlapping beef. Separate strips expose more surface to the oven heat.
- Probe lengthwise. A shallow vertical reading can miss the center of a thin strip.
- Check seasoning labels. Prepared blends may contain wheat, soy or other allergens.
- Rest after the temperature check. Cook steak to 145 degrees F and rest at least 3 minutes. Follow FDA food handling guidance.
Sheet Pan Steak Fajitas FAQs
Why are two trays needed?
They keep the vegetables and beef from forming a deep crowded pile. Crowding traps moisture and changes the roast.
Does all the oil go on the steak?
No, divide the quarter cup equally. Vegetables and steak each get two tablespoons.
When does the beef enter the oven?
After the vegetables have roasted for 12 to 15 minutes. Thin beef needs the shorter final cooking stage.
How do I check thin strips?
Insert the thermometer lengthwise into a thicker strip. Check several pieces for 145 degrees F and complete the 3 minute rest.
Are tortillas included in four servings?
The yield divides the beef and vegetables into four filling portions. Tortillas and rice are separate.
Sheet Pan Steak Fajitas with Peppers and Onions Recipe
Equipment
- Two 18 by 13 inch rimmed baking sheets
- Foil
- Tongs
- Instant read thermometer
Ingredients
Filling
- 1 pound flank steak Acrossgrain;1/2 inch strips
- 1 tablespoon lime juice
- 1/4 cup olive oil 2 Tbmeat+2 Tbvegetables
- 3 tablespoons salt-containing fajita seasoning Halfmeat/halfvegetables
- 1 medium yellow onion 1/2 inch strips
- 1 medium red bell pepper 1/2 inch strips
- 1 medium green bell pepper 1/2 inch strips
- 1 medium yellow bell pepper 1/2 inch strips
- 1/2 teaspoon black pepper
Instructions
- Heat to 400 degrees F and line two 18 by 13 inch rimmed sheets. Coat vegetables with two tablespoons oil, half the seasoning and pepper.
- Roast 12 to 15 minutes. Slice steak across the grain and coat with lime, remaining oil and seasoning.
- Spread strips without overlap among vegetables and roast 8 to 12 minutes, turning once, until thick centers are 145 degrees F.
- Rest 3 minutes and divide filling into four portions with clean tongs.
