Preheat oven to 180°C or 350°F (or 160 fan) and line a 20cm (8 inch) square pan with baking paper
Using the paddle attachment on your stand mixer, beat the butter and sugar until light and fluffy
Add the vanilla and beat to combine
Add combined flour, salt and bicarb soda along with the oats, then mix on low until just combined
Spread half of the mixture into your prepared pan, reserving the rest for later
Spread over the biscoff topping, then sprinkle with the chocolate chips, shredded coconut and pecans
Now place small chunks of the remaining mixture evenly over the pan (no need to spread the mixture, as it will spread as it cooks)
Bake for 35-40 minutes, until beautifully golden.
Cool in pan, then remove and slice into squares. Or if you can't wait, just cut it in the pan and enjoy!