To make this Traditional Bread Sauce gluten free, replace the breadcrumbs with certified gluten-free breadcrumbs or finely crumbled gluten-free bread. Also verify that the whole milk, cream, spices, and any packaged ingredients are certified gluten free if cross-contamination is a concern. Because gluten-free breadcrumbs can vary in absorbency, you may need to add a small extra splash of milk while simmering to maintain a soft, creamy texture.