Melt butter in skillet over medium-low heat. Add mushrooms; saute until just softened. Add breadcrumbs; stir well. Add milk, Spinach & Herb Mix, Onion Onion and Seasoned Salt; cook until mixture thickens. Mix in dried beef and eggs. Pour in greased 8 x 8 baking dish; top with cheese. Bake uncovered at 325° for 25-30 minutes. Makes about 4 servings.