Butternut Squash Curry without carrot

1 onion , chopped 1 -2 teaspoon canola oil 2 tablespoons curry powder 1 tablespoon cumin 1 tablespoon coriander 1 teaspoon cinnamon 10 ounces frozen spinach ,[...]

2 lbs butternut squash, peeled, halved and seeded and cut into 1 inch chunks 1 large onion , cut into large chunks 4 garlic cloves 3 cups vegetable broth 1[...]