This homemade granola bar recipe calls for just 4 main ingredients, and then you can customize it withy any toppings you like!
Line a 9-inch square pan with parchment paper and set aside.
Transfer the mixture to the lined loaf pan, and press HARD to pack it into the pan. Pressing firmly will ensure that the bars stick together well later. Sprinkle any optional toppings over the top, if desired. (The chocolate chips will melt, so I use a piece of parchment paper over the top to help press them into place without making a mess.) Place the pan in the fridge or freezer to cool for 1 hour, then use a large knife to cut 10 evenly-sized bars.
These granola bars can be kept at room temperature for 3-5 days, or in the fridge in an airtight container for up to 1 month. You can also freeze them for up to 6 months if you'd like to make a larger batch. They can thaw overnight in the fridge, or in your purse if you'll need to be out and about.