You will need a medium non-stick or cast iron skillet, and a 2 quart baking dish.
1. Thaw frozen spinach. Once spinach is thawed, drain it throughly by squeezing it in a colander (use a bowl to press the spinach down in the colander).
2. In a medium saucepan, over low heat, combine garlic, onion, and olive oil. Saute until browned, about 5 minutes.
3. Slowly stir in spinach, and cook through. Stir in the yogurt, pepper, and 1 tablespoon cheese. Remove from heat.
4. Place in medium baking dish. Drizzle cream and remaining cheese over the top. Bake at 350 degrees for 20 minutes. Mixture should be bubbly.