Start by heating 1 tablespoon of olive oil in a large skillet over medium heat. While the oil is heating, season the chicken tenders with chili powder, onion powder, garlic powder, and ½ teaspoon of kosher salt. Make sure the chicken is evenly coated with the spices.
Once the oil is hot, add the seasoned chicken tenders to the skillet. Cook for about 5-7 minutes on each side, or until the chicken is cooked through and has a nice golden-brown color. Remove the chicken from the skillet and let it rest for a few minutes before slicing it into bite-sized pieces.
In the same skillet, add the remaining tablespoon of olive oil and diced white onion. Sauté the onion for about 3-4 minutes, or until it becomes translucent and fragrant.
To assemble, start by spreading a layer of warm refried beans on each tostada. Next, top with the sliced chicken, sautéed onions, diced Roma tomatoes, and a sprinkle of lime juice from one half of the lime.
Top each tostada with slices of avocado, a dollop of sour cream, and a sprinkle of fresh cilantro. Squeeze the remaining lime juice over the top for extra zest.
Arrange the assembled tostadas on a serving platter and serve immediately. Enjoy the combination of crunchy, creamy, and zesty flavors with every bite!