Ingredients:
1 stick of unsalted butter
1/4 cup of honey or golden syrup
1/2 cup brown sugar
1/2 tsp vanilla
1/2 Tbsp cinnamon
1/4 tsp allspice
1/2 tsp salt
2 1/2 cups quick cooking oats

I also added these to my bars but you could use any dried fruit you prefer. Sweetened coconut, nuts, chia seeds, hemp seeds, toffee chips, and mini-chocolate chips would be yummy as well.
Directions
Add the butter, honey or golden syrup, and brown sugar to a sauce pan and stir over medium-low heat until the mixture begins to bubble.
Stir the mixture slowly as it bubbles for 2-3 minutes and then take it off the heat. You don’t need to time it, you’re just looking for everything to become well incorporated. You shouldn’t feel any sugar granules when you stir.
Remove the pan from the heat and add the vanilla, cinnamon, allspice, and salt. Whisk to combine.
In a large bowl, add the oats and any additional items you might want in your bars.
Add the caramel mixture to the oats and stir until the mixture comes together and everything is well incorporated.
Lightly spray an 8×8 pan with non-stick spray, or line with plastic wrap or parchment paper.
Dump the mixture into the pan and press it with your fingers to even it out. If things start to get too sticky, just dampen your hands a bit.
Allow the bars to cool completely before slicing.

Store in an airtight container.
*Updated 9/5/15: After making these bars several times since the recipe was originally posted, I’ve been able to make a few changes that actually make this recipe much faster and easier than it was before.
I’ve listed a few additional alterations below. I hope you like this new and improved flapjack recipe as much as the original.
Rolled oats can be used instead of quick-cooking oats. Just give them a pulse or two in the food processor or blender first.
I sometimes toast my oats before adding them to the caramel mixture by spreading them onto a dry sheet pan and sliding them into a preheated 350° oven for 1-2 minutes.
For crispier bars: Press the mixture into an 8×8 pan and bake in a preheated 350° oven for about 10 minutes. I’ve actually gotten sidetracked and left them in the oven for up to 15 minutes and they were fine. Allow to cool completely before slicing into bars.