Buttermilk Fried Chicken Fingers

Name: Buttermilk Fried Chicken Fingers
Ingredients: 3 1/2 cups buttermilk; 3 1/2 cups whole milk; 1 small Spanish onion, cut into 1/2-inch thick slices; 2 medium jalapeños, sliced; 1 tablespoon kosher salt; 1 tablespoon Tabasco pepper sauce; 2 pounds skinless, boneless chicken thighs, cut into 2x4-inch strips; 3 1/2 cups all-purpose flour; 2 tablespoons granulated garlic; 2 tablespoons onion powder; 1 tablespoon plus 1 teaspoon dried thyme; 2 teaspoons ground sage; 1 tablespoon smoked paprika; 1/2 teaspoon cayenne pepper; 1 tablespoon plus 1 teaspoon kosher salt; 1 tablespoon plus 1 teaspoon coarse ground black pepper; Canola oil, for frying; Homemade or store bought ranch dressing, for serving; deep fry/candy thermometer, two 13x18-inch rimmed baking sheets, 2 wire cooling racks