Cheesy Mornay Sauce elevates our rustic breakfast pizza into a company-worthy pie.
Melt butter in a heavy saucepan over medium-low heat; whisk in flour until smooth. Cook, whisking constantly, 2 minutes. Gradually whisk in half-and-half; increase heat to medium, and cook, whisking constantly, 3 to 5 minutes or until thickened. Remove from heat, and whisk in Parmesan cheese, pepper, and kosher salt.