Preheat oven to 425°F (220°C). Line a baking sheet with a wire rack and spray the rack with nonstick spray.
Season the chicken tenders all over with kosher salt, black pepper, and a light sprinkle of garlic powder.
Set up a dredging station: bowl 1 – flour; bowl 2 – lightly beaten eggs; bowl 3 – crushed potato chips.
Working one at a time, coat each tender in flour, shake off excess, dip in egg, then press into crushed potato chips to fully coat; place on the sprayed wire rack.
Lightly spray the coated chicken with oil spray to promote browning and crisping.
Bake the chicken fingers for 18–22 minutes, until golden and cooked through (internal temperature 165°F/74°C). Remove promptly from the rack using a spatula or tongs.
Toss broccoli florets with 1–2 tablespoons olive oil and a sprinkle of salt, pepper, and garlic powder.
Roast the broccoli on a separate sheet or alongside the chicken in the 425°F oven for 15–20 minutes, until slightly charred and tender.
Make the ranch: combine Greek yogurt (or sour cream), mayonnaise, milk, chives, dill, parsley, lemon juice, garlic powder, onion powder, 1/2 teaspoon salt, 1/2 teaspoon pepper, and smoked paprika in a blender or food processor; blend until smooth and combined.
Serve the potato chip–crusted chicken fingers and roasted broccoli drizzled with or served alongside the ranch.