Preheat your oven to 425 degrees F. This is important to ensure your chicken cooks perfectly. While the oven heats up, grab a baking dish and spray it with nonstick spray to prevent sticking.
In a small bowl, combine salt, pepper, smoked paprika, chili powder, cumin, and garlic powder. Make sure to mix them well; this spice rub is what will flavor your chicken.
Once the oven is ready, pat the chicken thighs dry with a paper towel. This step is crucial as it allows the spice rub to adhere better. After drying, take the spice mix and cover the chicken evenly.
Next, take the sliced onion and spread it all over the bottom of the prepared baking dish. This will not only add flavor but also create a lovely bed for your chicken.
Place the seasoned chicken thighs on top of the onions, and tuck the lime wedges in between the pieces of chicken. This will infuse the chicken with a zesty flavor as it cooks.
Cover the baking dish with foil to keep the moisture in while baking. Pop the dish into the oven and bake for 45 to 60 minutes. The chicken should be cooked through and tender.
While the chicken is baking, you can prepare the goat cheese queso. In a small saucepan over medium heat, add butter, jalapeño, and garlic. Cook for 1 to 2 minutes until everything is sizzling.
Next, whisk in the flour to create a roux. Cook this mixture for another 1 to 2 minutes until it turns golden and bubbly. This will help thicken your queso.
Pour in the milk gradually, whisking well to avoid lumps. Reduce the heat to low and allow the mixture to thicken slightly.
Once the queso has thickened, add in the goat cheese and stir until it melts completely. Taste and adjust seasoning with salt and pepper if needed. Keep it warm on low heat.
Once the chicken is done, remove it from the oven and let it cool slightly. Shred the chicken using two forks.
To assemble your tacos, warm the tortillas and place some shredded chicken on each one. Top with a generous amount of the goat cheese queso, followed by chopped tomatoes, sliced avocado, sliced red onion, and extra goat cheese crumbles. Squeeze lime juice on top for that extra zing!
Serve your delicious tacos immediately and enjoy!