1. Preheat oven to 475°.
2. Place tenderloin on a broiler pan coated with cooking spray. Sprinkle with salt and pepper. Bake at 475° for 10 minutes. Reduce oven temperature to 425° (do not remove tenderloin from oven); bake an additional 20 minutes or until thermometer registers 145° (medium-rare) to 160° (medium) or until desired degree of doneness. Cover tenderloin with foil; let stand 10 minutes. Cut tenderloin across grain into very thin slices.
3. Spread each baguette slice with 1 teaspoon Herb-Garlic Cream; top each with 1 spinach leaf. Divide beef evenly among bread slices; sprinkle each with 1/2 teaspoon cheese.