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["Set oven to 350 degrees /Grease a 13"" x 9"" baking pan /In a saucepan, combine the brown sugar, sour cream, 2 tbsp butter and cornstarch /Cook, and stir over medium heat until mixture comes to a boil.", "/Remove from heat.", "/Stir in 1 tsp vanilla; set aside.", "/Melt the remaining butter; place in a mixing bowl.", "/Add icecream; stir to blend.", "/Add eggs, one at a time, beating well after each addition; stir in the remaining 1 tsp vanilla.", "/In a bowl, combine the flour, cracker crumbs, sugar.", "baking powder and salt; gradually add to icecream mixture until combined.", "/Pour into prepared baking pan.", "/Drizzle with half of the praline sauce.", "/Bake for 25-30 minutes, or until cake tests done.", "/Cool on wire rack.", "/Add pecans to remaining sauce; spoon over warm cake (the sauce will not cover entire cake).", "/Cool in pan, serve with whipped cream."]