Ina Gartens Cauliflower Toasts

Name: Ina Garten's Cauliflower Toasts
Ingredients: 1 small head cauliflower (2 pounds); 4 tablespoons good olive oil; 1/4 teaspoon crushed red pepper flakes; Kosher salt and freshly ground black pepper; 12 ounces Italian mascarpone cheese, at room temperature; 6 ounces Gruyère cheese, grated; 4 ounces thinly sliced prosciutto, julienned; 1/4 teaspoon ground nutmeg; 6 large slices country-style bread; Paprika; Freshly grated Italian Parmesan cheese; 2 tablespoons minced fresh chives; Flaked sea salt, such as Maldon