Place granola in a small resealable food storage bag; seal tightly. Crush to coarse crumb texture; set aside.
Combine water, lemon juice, and cornstarch in a small bowl; stir until cornstarch is completely dissolved.
Combine apples, cornstarch mixture, and cinnamon in 10-inch skillet; stir until blended. Heat over medium-high heat. Bring to a boil. Boil 1 minute, or until thickened, stirring constantly.
Remove skillet from heat. Gently fold in raspberries, sugar substitute, vanilla, and almond extract. Sprinkle granola crumbs evenly over top. Let stand, uncovered, 30 minutes.