📖 Instructions

1. Before anything else, preheat your oven to a hearty 400°F (200°C). While the oven is warming up, grab a large baking sheet—the bigger, the better for even cooking. Line it with parchment paper for the easiest cleanup ever, or lightly grease it if you don't have parchment handy. This small step saves you so much scrubbing later!
2. In a large skillet, place your ground beef (or turkey or chicken!) over medium-high heat. Break it up with a wooden spoon or spatula, stirring occasionally, until it's beautifully browned and no pink remains, which usually takes about 6 to 8 minutes. Don't rush this step, as browning the meat properly adds a lot of flavor. Once cooked, carefully drain any excess grease. This is important for a non-soggy taco filling.
3. Now, back to the skillet with the drained meat. Stir in your favorite taco seasoning—I usually use about 2 tablespoons, but adjust to your taste. If your seasoning doesn't already contain it, add 1/4 cup of water. Let it simmer for a couple of minutes until the liquid has mostly evaporated and the meat is fragrant and well-coated. Remove from heat and set aside.
4. On your prepared baking sheet, spread out your chopped bell peppers and onion in a single layer. Drizzle them lightly with about 1 tablespoon of olive oil and season with a pinch of salt and pepper. Give them a good toss right on the sheet pan to ensure they're evenly coated. You want these veggies to get a head start on roasting.
5. Pop the baking sheet with just the seasoned vegetables into your preheated oven. Roast them for about 10-12 minutes. You're looking for them to start softening and getting those lovely slightly charred edges. This initial roast really brings out their sweetness and helps them cook through without becoming mushy when combined with the meat.
6. Carefully remove the sheet pan from the oven. Now, evenly spread the seasoned ground beef mixture over the partially roasted vegetables. Make sure everything is distributed in a relatively even layer across the pan. This helps ensure everything cooks consistently and gets a nice bit of heat.
7. If you're using corn or flour tortillas, now's the time to get them ready. Lay them flat on a separate, ungreased section of the same sheet pan if you have space, or use another small baking sheet. You want them to warm up and become pliable. If you're using hard taco shells, you can warm these up on the side too, or wait until the very end.
8. Return the sheet pan with the meat and veggies (and tortillas, if using) to the oven. Continue roasting for another 5-7 minutes. During this time, the flavors will meld, the meat will heat through, and the vegetables will finish cooking to tender-crisp perfection. The tortillas will also soften beautifully.
9. Carefully remove the sheet pan from the oven. Give the meat and veggie mixture a quick stir. If desired, sprinkle some shredded cheddar or Monterey Jack cheese over the hot filling on the sheet pan and let it melt for a minute or two from the residual heat, or pop it back in the oven for just 1-2 minutes until bubbly. This makes for extra gooey tacos!
10. Serve immediately! Let everyone build their own tacos with the warm filling and tortillas. Offer a variety of your favorite toppings: shredded lettuce, diced tomatoes, sour cream or Greek yogurt, salsa, guacamole, fresh cilantro, a squeeze of lime juice, or even some pickled jalapeños. Enjoy the delicious, easy, and satisfying meal you just created with minimal effort!