Preheat oven to 375°.
Place cubed rye bread into a 2-quart plastic bag or large bowl and mix with melted butter.
Place buttered cubes onto a rimmed baking sheet.
Bake until lightly browned, approx. 15 minutes, stirring occasionally, set aside.
Prepare Gary’s QuickSteak Corned Beef according to package directions in a large ovenproof skillet. Remove meat from skillet.
Drain sauerkraut and squeeze as much extra liquid from kraut as possible.
Add all remaining ingredients to the skillet, add kraut and prepared corned beef and mix together.
Add buttered rye bread and mix all ingredients in skillet, coating bread cubes.
Place skillet into the oven and bake for 40 minutes or until filling is bubbly.