Soft & Chewy Chocolate Flapjacks

"These soft and chewy triple chocolate flapjacks are so easy to make. Rolled oats tossed with melted butter, chocolate chips and vanilla all baked to golden perfection. Drizzle it and cover it all with more chocolate and you’re on to dessert bliss. One bowl and one pan are all you need for these absolutely gorgeous chocolatey oat bars. Ingredients needed for chocolate flapjacks jumbo rolled oats butter golden syrup light brown sugar (Aldi UK now stocks this. It’s a new item!) milk & dark chocolate chips 1 dark chocolate bar vanilla (optional)"