Preheat oven to 425°F. Whisk lemon zest, lemon juice, garlic, oregano, jalapenos, oil and salt in a 9-by-13-inch glass baking dish. Add tenders, bell pepper and onion; toss to coat. Spread the mixture out evenly; cover with foil. Bake until the chicken is cooked through and no longer pink in the middle, 25 to 30 minutes.