Combine flour, baking soda, salt, sugar, crackers and melted butter in that order.
Spread 1/2 of the mixture in a lightly buttered 9-inch pie plate. Cover with blueberry
pie filling which has been mixed with lemon juice, and then top with the remaining
soda cracker mix.
Bake for 25 to 30 minutes.
Cool on rack.
Serve with lightly sweetened-vanilla flavored whipped cream or with vanilla ice