To test your oven for hotspots preheat to 350 degrees and place pieces of white bread directly onto the oven rack as seen in the picture. After 15 minutes the bread was toasted enough to see where the hot spots were located. The top side of the bread looked pretty evenly toasted but as you can see from the picture, the bottom side revealed definite differences in the oven heating pattern. Now that I know this, I will certainly consider rotating my baked products halfway through the baking time.
