These Apple Cinnamon Oat Crumble Bars are a delightful treat combining the comforting flavors of apple and cinnamon with a buttery oat crumble.
Preheat your oven to 350°F (175°C).
Preheating ensures even baking from the start.
Grease a 9-inch square baking pan with nonstick cooking spray.
Ensure the pan is well-greased to prevent sticking.
In a large mixing bowl, combine the oats, flour, brown sugar, and cinnamon.
Mix thoroughly to evenly distribute the cinnamon.
Add the butter to the dry mixture and mix with an electric mixer on low speed until crumbly.
Cold butter works best for a crumbly texture.
Press half of the crumb mixture into the prepared baking pan to form the base.
Press firmly to create an even layer.
Spread the apple preserves evenly over the base layer.
Use a spatula for an even spread.
Sprinkle the remaining crumb mixture over the apple filling and gently press down.
Press lightly to keep the crumble texture.
Bake in the preheated oven for 30-35 minutes or until golden brown.
Check for a golden color to ensure doneness.
Remove from the oven and let cool completely on a wire rack.
Cooling helps the bars set for easier cutting.
Cut into 16 bars and serve.
Use a sharp knife for clean cuts.