Prep: Preheat oven to 400°F (204°C). Drain butter beans and pat as dry as possible with paper towels.
Mix: In a large bowl, stir together ¼ cup tahini, 1 Tbsp olive oil, and ½ tsp each salt, garlic powder, onion powder, smoked paprika. Gently fold in the butter beans.
Bake: Arrange beans on a parchment-lined baking sheet in a single layer. Bake for about 30 minutes, flipping the beans once during cooking, until golden brown and crispy (they'll continue to crisp up as they cool).
