Step 1

In a mixing bowl, whisk together the cream of mushroom soup and dry onion soup mix.

Step 2

Layer ingredients into your slow cooker as follows: ¼ of the soup mixture, ½ the sliced onions, all of the cubed steak, remaining onions, remaining soup mixture, butter slices.

Step 3

Cover and cook on low for 4 - 6 hours, or high for 3- 4 hours, until meat is tender.

Step 4

Garnish as desired.