Preheat oven to 450°.
Rinse okra and pat dry.
In small bowl, mix salt, pepper, smoked paprika, garlic powder, onion powder, cayenne pepper, and cumin.
In zip lock bag, add okra, olive oil, lemon juice, and spices. Shake bag to coat okra with spices.
Spray baking sheet with non-stick cooking spray.
Lay okra on baking sheet in single layer.
Roast in oven for 10 minutes.
With a spatula, turn okra on other side and cook for another 15 minutes.