Pat the turkey breast dry. In a small bowl, combine the jalapeño, onion, sun-dried tomatoes, cilantro, olive oil, salt, and pepper.
Rub and gently press the seasoning mixture over both sides of the turkey breast.
Cook the turkey in a lightly greased skillet over medium heat for about 6–8 minutes per side, depending on thickness, until it reaches an internal temperature of 165°F.
Transfer the turkey to a plate and allow it to cool completely. Dice into bite-sized pieces.
While the turkey cools, place the almonds in a dry skillet over medium-low heat. Toast for 3–4 minutes, stirring frequently, until lightly golden and fragrant. Transfer to a plate to cool.
In a large bowl, combine the diced turkey, fire-roasted corn, tomatoes, bell peppers, green onions, cheddar Jack cheese, and additional cilantro.
In a small bowl or jar, whisk together the olive oil, fresh lemon juice, cilantro, cumin, salt, and black pepper until combined.
Pour the vinaigrette over the turkey mixture and toss gently until evenly coated.
Cover and refrigerate for at least 30 minutes. Add the toasted almonds immediately before serving.