Hi Cindy, baking at high altitude will always require some adjustments for best results, and we have a chart to help. The edges of a cake will also set and bake more quickly of the pan is dark in color or glass. If that's the case, lower the temperature by 25°F (in addition to any changes you make to account for altitude) and expect the bake time to be a few minutes longer, but it should bake more evenly. 

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