Preheat the oven to 450°F (230°C). Line a baking sheet with foil and place a wire rack on top; spray the rack with nonstick spray.
Season the chicken tenders evenly with 1/2 teaspoon salt, 1/2 teaspoon pepper, and 1/2 teaspoon garlic powder.
Pulse 1 1/3 cups unsalted pecans in a food processor until coarse crumbs remain; transfer to a plate.
Beat the 2 eggs in a separate shallow bowl. Dip each seasoned tender into the eggs, then press into the pecan crumbs to coat thoroughly; place coated tenders on the prepared rack.
Spray the tops of the pecan-crusted tenders lightly with olive oil mist, then bake 12 minutes, flip, and bake another 12 minutes, or until the chicken reaches 165°F and is golden.
While the chicken bakes, make the vinaigrette: whisk together 2 tablespoons orange juice, 1 1/2 tablespoons lemon juice, 1 1/2 tablespoons grapefruit juice, 1 tablespoon honey, 1 teaspoon Dijon, 2 minced garlic cloves, 1/4 teaspoon salt, and 1/4 teaspoon pepper. Slowly whisk in 1/2 cup extra virgin olive oil until emulsified.
Prepare the kale by chopping or tearing into bite-size pieces, placing in a bowl, drizzling with 1 to 2 teaspoons olive oil, and massaging for 2–3 minutes until tender; let rest 5 minutes.
Slice the cucumber and segment the Cara Cara oranges.
Assemble the salad: toss the massaged kale with orange segments, sliced cucumber, 1/2 cup whole pecans, and pickled onions if using.
Slice or halve the baked pecan-crusted chicken and arrange on top of the salad. Drizzle with the citrus vinaigrette and sprinkle with 1/4 cup shaved Pecorino Romano before serving.