For a richer, heavier sauce, substitute heavy whipping cream for the half & half.
To make this recipe vegetarian, simply omit the bacon. You can add sautéed mushrooms for extra umami and texture.
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently on the stove, adding a splash of milk if the sauce has thickened too much.
Adjust the amount of flour if you prefer a thinner or thicker sauce consistency.