Preheat oven to 450 degrees F.
In a 10-inch cast iron pan or ovenproof skillet over medium heat, add oil. Add garlic and saute 1 minute. Add tomato paste and cook, stirring, for 1 minute.
Add salt, pepper, beans, and stock and stir to combine.
Turn off heat and add mozzarella and parmesan.
Bake for 10 to 15 minutes until cheese melted and desired golden brown.
Garnish with basil and serve with crusty bread.