We call this ‘Parisian Perfection.’ The savory, rich taste has everyone coming back for more, and I’ve made it at least five times this month!

4 large potatoes, thinly sliced
2 large onions, thinly sliced
2 tablespoons butter
1 tablespoon olive oil
1 cup beef broth
1 cup shredded Gruyère cheese
1 teaspoon salt
1/2 teaspoon black pepper
1 teaspoon dried thyme
1/2 cup heavy cream