Heat a large nonstick skillet over medium heat. Add spinach to pan; cook 3 minutes or until spinach is wilted, stirring occasionally. Add prosciutto to pan; sauté 1 minute or until crisp. Stir in pepper. Remove from heat; cool.
Arrange oysters in a single layer in a broiler pan; spoon about 1 tablespoon spinach mixture onto each oyster. Sprinkle oysters evenly with pine nuts. Bake at 450° for 5 minutes or until oysters are opaque. Serve immediately.