Pre-heat your oven to 350 degrees. Grease a 9x13 pan and set aside.
Cream together butter and sugar until light and fluffy. Add eggs and beat well. Mix in vanilla.
Whisk together the flour and salt; add to the creamed mixture and mix until combined.
Spread around 3 1/2 cups of batter on the bottom of the pan. Spread a layer of pie filling across the top. Drop remaining batter on top of pie filling.
Bake at 350 for 30-35 minutes or until toothpick inserted comes out clean. Cool on wire rack.
Combine the buttery vanilla glaze ingredients and drizzle over the bars. Add in more cream if you want a creamier consistency.