Butternut Squash and Feta Quiche

Name: Butternut Squash and Feta Quiche
Ingredients: 1 10 pie crust, http://www.kingarthurflour...; half Butternut Squash, cubed; 1 onion, sliced; 1 tablespoon olive, plus more for squash; 1-2 teaspoons balsamic vinegar; 1 cup chopped spinach; 4 eggs; 1 cup whole milk; 1 tablespoon fresh rosemary*; 1/2 tablespoon fresh thyme*, halved if dried; 1/2 brick of feta**