ADD basil, pine nuts and garlic to food processor and blend until finely minced.
ADD oil, heavy cream and Parmesan and blend until smooth. Season with salt and pepper.
SPREAD basil pesto on eight slices of bread and top with turkey, mozzarella, tomato, spinach and remaining bread slices.
MELT 2 tablespoons butter in large skillet over medium-high heat.
COOK two to three sandwiches at a time on each side until golden brown, about 3 minutes per side. Repeat with remaining butter and sandwiches.