To prepare this Shrimp Tortellini Alfredo as a gluten-free dish, substitute the all-purpose flour with a 1:1 gluten-free flour blend or cornstarch slurry (1 teaspoon cornstarch mixed with 2 teaspoons cold water). Additionally, use certified gluten-free tortellini—available at many health food stores or online retailers. Always double-check product labels, particularly for the tortellini and parmesan, as gluten-containing additives or cross-contamination may vary by brand.