Beef Stroganoff - Mrs. T's Pierogies

Ingredients

• 1 box Mrs. T’s Mini Classic Cheddar Pierogies
• 1 tablespoon butter
• ½ medium onion, chopped
• 1 clove garlic, minced
• 1 cup mushrooms, sliced
• 1 pound ground beef
• ½ teaspoon oregano
• 2 tablespoons cornstarch
• 2 teaspoons Worcestershire sauce
• 2 teaspoons Dijon mustard
• 1 ½ cups chicken broth
• ½ cup sour cream
• 2 tablespoons olive oil
• 2 tablespoons water