Roasted Asparagus With Onions without sprinkles

3 lbs asparagus , trimmed 1 lb mushroom , thickly sliced 1 large red onion , sliced 1/4 cup vegetable oil 1 1/2 teaspoons salt 1/2 teaspoon pepper 1 Heat oven[...]

1 lb fresh asparagus spear , trimmed 1 large purple onion , thinly sliced vegetable oil cooking spray 2 tablespoons balsamic vinegar 1 1/2 teaspoons orange[...]