Garlic butter steak bites with mashed potato and green beans

Ingredients:
1 tbsp olive oil
1 1/4 lbs. steak (cut into cubes (sirloin, tenderloin, rib eye, or strip steak))
3 tbsp butter
1 rosemary sprigs
1/2 tbsp Worcestershire sauce
4 cloves garlic (minced)
salt and pepper (to taste)

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