Giant Garlic-Cilantro Toasts

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1/2 cup (1 stick) chilled unsalted butter, diced

2 tablespoons grated Parmesan

3/4 teaspoon kosher salt

3/4 teaspoon freshly ground black pepper

Large pinch cayenne pepper

3 cloves garlic, peeled and crushed

1/2 cup (packed) chopped fresh cilantro

1 green onion, chopped

1 pain rustique loaf of bread