Thanks for all the warm responses The recipe indeed looks really simple and so I will definitely try again. The cake pan is 8x8 square greyish non-stick pan.
Charles, I didn’t use any bake-even stripe because the recipe did not call for it. But it does look like the sides are baked faster. So I plan to change it to the light silver pan when I bake again.
Julie, did u adjusted it much lower to 185 F and for how long would it then take to bake? The temperature that I use is 160C (recipe stated 325F).