Preheat your oven to 180 degrees Celsius and let it warm up while you prepare the mixture.

Lightly grease a square baking pan with butter or oil, or line it with baking paper to prevent sticking. Set it aside.

In a large mixing bowl, add the sourdough discard, ensuring it is at room temperature for better mixing.

Slowly pour in the melted butter and mix gently with a spoon until the mixture is smooth.

Next, add the honey or maple syrup and stir until everything is well combined.

Incorporate the vanilla extract and mix once more.

Now, add the dry ingredients: rolled oats, all purpose flour, brown sugar, baking soda, salt, and cinnamon powder.

Mix slowly to ensure the dry ingredients blend well with the wet ingredients, taking care to avoid any dry pockets.

The mixture will be thick and sticky, which is normal. If desired, fold in the chopped nuts or chocolate chips for added texture.

Pour the mixture into the prepared baking pan, using a spoon or spatula to spread it evenly and press it down lightly for a smooth top.

Place the pan in the oven and bake for about 30 minutes, checking after 25 minutes. The top should be golden and firm to the touch.

Once baked, remove the pan from the oven and let it cool completely on a cooling rack before cutting.

Cut into square bars using a sharp knife once cooled to prevent crumbling.

For added flavor, consider toasting the oats lightly before mixing them in, which enhances their nutty aroma.

You can also add a pinch of nutmeg or ginger powder for extra warmth without overpowering the taste.

These bars can be enjoyed with yogurt, fruit, or a warm drink, and they are delicious on their own or as part of a light meal.