In a 12-in. skillet, heat 1 tablespoon butter over medium heat. Cook pork 2-4 minutes on each side or until tender. Remove from pan., In same pan, heat remaining butter over medium-high heat. Add mushrooms; cook and stir until almost tender. Add garlic; cook 1 minute longer. Stir in potatoes, 1-1/2 cups broth, Worcestershire sauce, salt and pepper. Bring to a boil. Reduce heat; simmer, covered, 10-15 minutes or until potatoes are tender., In a small bowl, mix flour and remaining broth until smooth. Stir into mushroom mixture. Bring to a boil; cook and stir until sauce is thickened. Stir in green onions. Return pork to pan and heat through.