Preheat oven to 350 degrees. Mix the butter with the sugar and combine well. Add the vanilla, flour, and nuts. Press in bottom of 9x13-inch baking pan. Bake for 10 minutes. Remove from oven and set aside. Make filling by combining the cream cheese with the eggs, blending well. Add the sugar and vanilla and continue blending until smooth. Pour over the crust and smooth over covering the crust. Place the pear slices over the filling and completely cover; sprinkle with the sugar and cinnamon. Bake at 375 degrees for about 25-30 minutes. Cool completely then refrigerate. Slice and serve.