Broccoli and Cheddar Twice-Baked Potatoes

Ingredients:° 4 potatoes °1 teaspoon olive oil ° 3 & 1/2 tsp very soft salted butter ° 1/2 cup fat-free Greek yogurt ° 1/4 cup milk ° 1/2 teaspoon salt ° 1/2 teaspoon pepper ° …