Filling:
4 cups sliced, peeled pears
1/3 cup sugar
2 tbsp. flour
1 cup sour cream
1/2 tsp. EACH vanilla, lemon and almond extracts
1 (9-in.) unbaked pie crust
Topping:
1/4 c. flour
2 tbsp. packed brown sugar
2 tbsp. butter, softened

In medium bowl, toss sliced pears with sugar and flour. In a small bowl, combine sour cream and extracts. Add to pear mixture and mix well. Pour into pie shell. In a small bowl, combine topping ingredients and mix until crumbly. Sprinkle over pear filling in pie shell. Bake in a 400 degree oven for 10 minutes. Reduce oven to 350 degrees and continue to bake for additional 45 minutes or until pears are tender.

Source: dessert.betterrecipes.com