Preheat oven to 350F.
In a large saute pan, heat butter over medium high heat.
Add diced onions and cook 2-3 minutes. Add shaved ribeye and minced garlic and cook another 4-5 minutes or until ribeye is cooked. Mix in salt and pepper. Turn off heat.
In a large bowl, mix together cream cheese and yogurt. Add steak mixture and mix until well combined.
Add half of the cheese to the steak mixture, stir until combined.
Pour into 8x8 baking dish. Sprinkle with remaining cheese.
Bake for 30-35 minutes or until bubbling.
Let cool 10 minutes and serve with crostini, bread, chips, or veggies,