Preheat the oven to 350°F (about 177°C), then line a baking pan (8'' or 9'') with parchment paper. Leave some paper hanging over the edges.
Blitz the oats in a blender or food processor (10 pulses for whole oats, 5-6 pulses for quick oats). Dump them into a big bowl.
Add the rest of your ingredients and mix until combined.
Spoon this mixture into your prepared pan. Use the spoon or spatula to press it down onto the baking pan.
Optional: Sprinkle 1 to 2 tbsp of chocolate chips on top for visual.
Bake for about 30 minutes until its edges START turning golden brown and the middle looks set.
Remove them from the heated oven. Set the pan at room temperature (about 30 to 60 minutes). Then, refrigerate the whole pan for 1 hour.
Lift these bars from your baking pan using the edges of the parchment paper. Cut them into squares. Enjoy every bite!