How to Make It
Light a grill or preheat a grill pan. Grill the Fresno chiles over high heat, turning, until blackened and softened, 4 to 5 minutes. Transfer the chiles to a bowl, cover with plastic wrap and let cool slightly. Peel, seed and mince the chiles and return them to the bowl. Add the Scotch Bonnet, butter and chives and stir until combined.
Lightly brush the mushrooms, eggplant, zucchini and corn with olive oil and season with salt and pepper. Grill the vegetables over moderately high heat, turning once or twice, until lightly charred and tender, about 5 minutes. Arrange the vegetables on a platter and immediately dot with the chile butter. Serve right away.