Here's What Happens When You Microwave A Frozen Pizza (It's Not Pretty) - Tasting Table
Briefly

Microwaving a frozen pizza can lead to unsatisfactory results, with soggy crusts and uneven heating. This occurs because the microwave heats ingredients at different rates based on their density and moisture levels. Denser toppings take longer to absorb heat, resulting in some areas being scalding while others remain frozen. To achieve better results, it's recommended to microwave the pizza on a paper towel-lined plate to help absorb excess moisture and improve texture, despite the inherent limitations of the microwave cooking method.
When microwaving a frozen pizza, uneven heating can result in soggy crusts and frozen toppings due to the variances in density and moisture content of the ingredients.
To achieve better results when microwaving pizza, place it on a paper towel to absorb moisture, which can reduce sogginess and improve overall texture.
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