Prevent Frozen Broccoli From Becoming Soggy By Skipping This Step - Tasting Table
Briefly

To achieve perfectly roasted frozen broccoli without the dreaded soggy texture, refrain from seasoning during the first 12 to 15 minutes of roasting. This process allows the vegetables to thaw and reduces moisture content before seasoning is applied. Key preventative steps include purchasing high-quality frozen broccoli without excessive ice crystals, avoiding overcrowding on the baking tray, and preheating the oven to 400 degrees Fahrenheit for best results. Following these methods guarantees a crunchy texture and enhances the overall flavor absorption.
Never purchase low-quality frozen broccoli. There shouldn't be excessive ice crystals (which impart extra moisture), and it's important that the vegetables still have a bold green color.
Hold fire with seasoning. Skip the seasoning and let the veggies roast for 12 to 15 minutes. After that, season to your heart's content.
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