what temperature do flap jacks go in the oven
For the ultimate flapjackâ¦. 1  Preheat the oven to 180Â°C/160Â° Fan, 350Â°F, Gas 4 while you combine the butter and Golden Syrup in a large non-stick saucepan. 2  Heat gently until melted, then remove from the heat and stir in the oats and salt. Bake on the middle shelf for 25 minutes, until gorgeously golden brown on top. 2  Remove and leave to cool in the tin for 10 minutes (you can trim the crisp edges, if you like), then cut into squares while still warm.