Butternut Squash and Goats Cheese with potatoes

2 tablespoons unsalted butter 4 cups thinly sliced onions 1 1/4 lbs butternut squash, peeled,seeded and cut into 1/4 inch slices 1 1/4 lbs yukon gold potatoes[...]

3 tablespoons olive oil 2 ounces butter 2 onions , peeled and sliced 2 garlic cloves , peeled and chopped 2 teaspoons thyme , finely chopped 2 teaspoons[...]