Place flour in a mixer bowl; beat in 1/4 cup oil (mixture will be slightly crumbly). In a small bowl, slowly whisk warm water into beaten egg; add to flour mixture, mixing well. Beat in remaining oil until smooth. Transfer to a greased bowl, turning once to grease the top. Cover and let rest in a warm place about 30 minutes., Preheat oven to 350°. Spread bread crumbs into an ungreased 15x10x1-in. baking pan. Bake 10-15 minutes or until golden brown, stirring occasionally. Cool completely., Tape a 30x15-in. sheet of parchment onto a work surface; dust lightly with flour. Divide dough in half; place 1 portion on parchment and roll to a very thin 24x15-in. rectangle. (Keep remaining dough covered.) Remove tape from parchment., Sprinkle 3/4 cup bread crumbs over rectangle to within 1 in. of edges. Starting 3 in. from a short side, sprinkle 3 cups apples and 1/4 cup raisins over a 3-in.-wide section of dough. Mix sugar and cinnamon; sprinkle half of the mixture over fruit. Drizzle with half of the melted butter., Roll up jelly-roll style, starting at fruit-covered end and lifting with parchment; fold in sides of dough as you roll to contain filling. Using parchment, transfer strudel to a 15x10x1-in. baking pan; trim parchment to fit pan., Bake on lowest oven rack 45-55 minutes or until golden brown, brushing top with sour cream 2 times while baking. Repeat with remaining ingredients., Using parchment, transfer to a wire rack to cool. Serve warm or at room temperature.