the dry pasta shells into the ceramic baking dish and spread them into an even layer. The shells should mostly cover the bottom of the dish in a single, slightly overlapping layer.
Scatter the frozen green peas evenly over the dry pasta shells. This layering helps the peas steam and stay tender while the pasta absorbs the liquid.
In a mixing bowl or large measuring cup, whisk together the broth, heavy cream, grated Parmesan, salt, and black pepper until the cheese is mostly dissolved and the mixture looks smooth. Taste
