Hi there, Hazel! We're sorry to hear that you're having a bit of trouble with your recipe. Most often these dense streaks are from over-mixing or from not scraping the mixing bowl well while incorporating ingredients. Has your mixing method changed at all? Maybe a new mixer? We'd recommend creaming your sugar and butter until they're light and fluffy, but not for so long that the mixture starts to deflate. Also ensuring that the bottom of the bowl is being scraped well throughout the process is important. We hope this helps for future baking adventures! 

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