Preheat oven to 350°.
Arrange baguette slices in a single layer on 2 large baking sheets, and coat bread with cooking spray. Bake at 350° for 10 minutes or until crisp and lightly browned.
Place mayonnaise, garlic, 1/3-less-fat cream cheese, and fat-free cream cheese in a large bowl; beat with a mixer at medium speed until well blended and creamy. Stir in 1/2 cup Parmesan cheese, bacon, artichoke hearts, and spinach. Spread mixture into an 11 x 7-inch baking dish coated with cooking spray. Sprinkle with remaining Parmesan cheese. Bake at 350° for 25 minutes or until thoroughly heated. Serve with toasted baguette slices.