Rosemary Mushroom Crostini

Name: Rosemary Mushroom Crostini
Cuisine: European, Italian, Mediterranean
Ingredients: 1 bread; 2 tbsp (30 mL) butter; 1/4 cup (60 mL) red onion finely chopped; 1 large garlic clove minced; 5 1/2 cups (1.375 L) finely chopped mixed mushrooms; 1/4 cup (60 mL) 35 % cream; 1 tsp (5 mL) minced fresh rosemary; 1 cup (250 mL) grated Emmental cheese or Sharp Cheddar cheese; 1/2 cup (125 mL) freshly grated Canadian Parmesan cheese; Salt and freshly ground pepper to taste; Whole pink peppercorns; Rosemary