Preheat oven to 425 degrees F.Pour 3 tablespoons olive oil into a small bowl; use a pastry brush to brush bread with oil on both sides. Toast 10 - 15 minutes, until crisp and golden, flipping halfway through.Meanwhile, stir to combine chèvre with 2 tablespoons each honey and olive oil. Fold in minced rosemary and a generous pinch each sea salt and pepper.Toss grapes with 1 tablespoon olive oil, rosemary sprigs, and a pinch each chili powder, sea salt, and pepper. Spread on a rimmed baking sheet, and roast 9 - 12 minutes or until grapes just start to burst, shaking pan often.Spread honey chèvre mixture on toasts and top with grapes; serve immediately.