Sheet Pan Garlic Lime Salmon Fajitas

Weeknight dinners that feel special are my favorite kind — and these Sheet Pan Garlic Lime Salmon Fajitas deliver on flavor, ease, and cleanup. Crisped bell peppers, sweet onions, juicy salmon fillets, and a bright garlic-lime punch all roast together on one pan, giving you a vibrant, restaurant-worthy meal in under 30 minutes of hands-on time. If you like bold fajita flavors but want a lighter, seafood-forward twist, this recipe is for you.

Why this recipe works

There are a few reasons these Sheet Pan Garlic Lime Salmon Fajitas are so satisfying. Salmon cooks quickly and stays tender when roasted at high heat, and the combination of three colors of bell pepper plus onion offers great texture and color contrast. A packet of fajita seasoning gives that classic Tex-Mex backbone while fresh lime juice and minced garlic brighten everything up. Best of all, everything bakes together on a single sheet pan so you get charred edges and juicy centers with minimal fuss.

Ingredients

• 4 (6-ounce) salmon fillets
• 1 sliced yellow bell pepper
• 1 sliced red bell pepper
• 1 sliced green bell pepper
• 1 sliced medium-sized onion
• 1 (1.12 ounce) packet McCormick Fajita Seasoning Mix
• juice of one lime
• 3 minced garlic cloves
• 3 tablespoons olive oil
• 1 tablespoon water
• fresh lime slices
• chopped cilantro for garnish

Equipment

• Half-sheet pan (or large rimmed baking sheet)
• Mixing bowl
• Sharp knife and cutting board
• Tongs or spatula
• Measuring spoons

Prep at a glance

Preheat the oven to 425°F (220°C). Slice the peppers and onion into even strips so they cook at the same rate. Mince the garlic, juice the lime, and measure the olive oil and water. The marinade comes together in the mixing bowl; then everything moves to the sheet pan for roasting. This approach keeps things moving smoothly and minimizes juggling pans.

Flavor tips

• If you love heat, add a pinch of crushed red pepper to the marinade or serve with sliced jalapeños.
• For extra char, broil the sheet pan for 1–2 minutes at the end, watching closely so nothing burns.
• Want more herbiness? Stir a couple of tablespoons of chopped cilantro into the marinade before roasting.
• If your garlic is especially strong, reduce the amount to 2 cloves — the lime and fajita seasoning will still shine.

Serving suggestions

Warm flour or corn tortillas are the classic choice for these Sheet Pan Garlic Lime Salmon Fajitas. Spoon the roasted peppers, onions, and flaky salmon into tortillas and top with fresh lime slices, chopped cilantro, and a dollop of sour cream or plain yogurt. For a low-carb option, serve over a bed of mixed greens or with cauliflower rice. Leftovers make excellent salad toppers the next day.

Step-by-step instructions

The directions below follow the source recipe order and use the ingredients exactly as listed. I’ve rewritten each step into clear, actionable instructions so your sheet-pan dinner comes together with confidence.

1. Preheat your oven to 425°F (220°C) and line a large rimmed sheet pan with parchment paper or lightly oil it for easy cleanup.
2. Prepare the vegetables: slice the yellow, red, and green bell peppers into even strips and slice the medium-sized onion into similar-width strips so everything cooks evenly.
3. In a mixing bowl, combine the contents of one (1.12 ounce) packet McCormick Fajita Seasoning Mix, the juice of one lime, 3 minced garlic cloves, 3 tablespoons olive oil, and 1 tablespoon water. Whisk these together until the mixture is smooth and the seasoning is evenly dispersed.
4. Add the sliced peppers and onion to the bowl with the fajita-lime-garlic mixture. Toss the vegetables thoroughly until each piece is coated in the seasoning and oil blend.
5. Arrange the seasoned peppers and onions in an even layer across the prepared sheet pan, leaving space in the center or to one side for the salmon fillets so everything has room to roast rather than steam.
6. Pat the 4 (6-ounce) salmon fillets dry with a paper towel. Place the fillets skin-side down (if your fillets have skin) on the sheet pan amid the vegetables or in the reserved space. Spoon any remaining marinade over the tops of the salmon so they are lightly coated.
7. Place the sheet pan in the preheated oven and roast for 12–15 minutes, depending on the thickness of your salmon fillets. You’re aiming for the salmon to be opaque through the middle and flake easily with a fork. The peppers and onion should be tender with lightly charred edges.
8. If you prefer more color on the vegetables or salmon, switch the oven to broil for 1–2 minutes at the end of cooking. Watch carefully to prevent burning.
9. Remove the sheet pan from the oven and let the salmon rest for 2–3 minutes. Squeeze any remaining fresh lime juice over the salmon and vegetables, and garnish with fresh lime slices and chopped cilantro before serving.
10. Serve the roasted salmon and vegetables with warm tortillas or your favorite sides. Use tongs or a spatula to portion the salmon and peppers into wraps, top with additional garnishes as desired, and enjoy.

Timing and yield

This recipe serves 4. Active prep time is about 15 minutes; oven time is 12–15 minutes. From start to finish you’re looking at roughly 30–35 minutes, depending on how quickly you slice the vegetables and heat the oven. Each serving includes a 6-ounce salmon fillet plus a generous portion of roasted peppers and onions.

Nutrition snapshot

Salmon is rich in omega-3 fatty acids and protein, while bell peppers and onions contribute fiber, vitamin C, and antioxidants. Olive oil adds healthy monounsaturated fats and the lime and garlic provide bright, fresh flavor without extra calories. Exact nutrition will vary by salmon cut and tortilla choice, but this dish is a balanced, nutrient-dense option for a family dinner.

Make-ahead and storage

You can slice the peppers and onion up to a day in advance and store them covered in the refrigerator. Whisk the fajita seasoning, lime juice, garlic, olive oil, and water together just before tossing with the vegetables so the flavors remain bright. Cooked salmon and roasted vegetables will keep in an airtight container in the fridge for up to 3 days. Reheat gently in a low oven or enjoy cold over a salad.

Variations and swaps

• Swap salmon for another firm fish fillet if you prefer — keep the same cooking time as long as fillets are similar in thickness.
• If you want plant-based fajitas, replace salmon with thick slices of marinated portobello mushrooms and follow the same roast time.
• Switch up the fajita seasoning packet for a homemade blend (chili powder, cumin, smoked paprika, garlic powder, onion powder, salt) if you prefer to control the salt level.

Common questions

Can I use frozen salmon fillets? Yes. Thaw them completely in the refrigerator before proceeding so they roast evenly and reach the correct internal temperature.

What if I don’t have a fajita seasoning packet? A simple mix of 1 tablespoon chili powder, 1 teaspoon cumin, 1 teaspoon smoked paprika, 1/2 teaspoon garlic powder, 1/2 teaspoon onion powder, and a pinch of salt can stand in for the packet.

How do I know when salmon is done? Salmon is ready when it flakes easily with a fork and is opaque in the center. For a more precise check, the internal temperature should be 125–130°F for medium doneness or 145°F if you prefer well done.

Final thoughts

These Sheet Pan Garlic Lime Salmon Fajitas are proof that weeknight cooking can be fast, flavorful, and a little bit fancy. The bright lime and garlic marry perfectly with fajita seasoning while the peppers and onions bring sweetness and crunch. One pan, bold flavor, and very little cleanup — what more could you ask for?

Make a batch tonight and savor the way the salmon flakes right into the warm tortillas, kissed with citrus and herbs. Leftovers? Even better the next day. Happy cooking!