Butternut Squash Mashed Potatoes without apples

2 lbs butternut squash, peeled, seeded, cut into 1-inch cubes 2 tablespoons olive oil 1 tablespoon kosher salt black pepper , to taste 2 lbs idaho potatoes 4[...]

1 1/2 lbs potatoes , peeled and cut into 1/2 inch wedges. about 4 cups 1 1/2 lbs butternut squash, peeled and cut into 1 inch wedges, about 4 cups 6 garlic[...]