Cooking Instructions:

Preheat your oven to 350°F (177°C) and line an 8-inch square baking pan with parchment paper to prevent sticking.

In a mixing bowl, combine the brown sugar and peanut butter. Use a hand mixer or stand mixer to mix them together until the mixture is light in color and fluffy.

Gradually add the whole wheat flour, rolled oats, baking soda, and salt to the peanut butter mixture. Mix until well combined.

Slowly add milk, a little at a time, until a dough forms. The amount of milk needed may vary, so add just enough to achieve the right consistency.

Fold in chocolate chips and raisins if desired, then press the dough evenly into the prepared baking dish.

Bake the bars in the preheated oven for 17-20 minutes, or until they're lightly golden and set. Keep an eye on them to avoid overbaking.

Once baked, allow the bars to cool in the pan for a few minutes before lifting them out using the parchment paper. Let them cool completely on a wire rack before cutting into squares.

Extra Tips:

For added flavor, consider sprinkling a little sea salt on top before baking or reserving some chocolate chips to sprinkle after baking for a decorative touch. These bars can also be stored in the refrigerator for up to 2 weeks for a refreshing snack option.

If you prefer a denser bar, you can modify the recipe by increasing the amount of oats and flour.

Always remember to adjust the baking time if you decide to use a different pan size, as it may require a longer or shorter baking duration.