Kohlrabi Parmesan Bake

Ingredients

• 1 bunch kohlrabi (about 3 large stems with leaves)
• 2 tablespoons butter
• 2 tablespoons olive oil
• 1 1/2 cups heavy cream
• 1/3 cup Parmesan cheese
• 1/2 cup Panco bread crumbs
• 1 small onion, chopped
• salt and freshly ground black pepper