Roasted Potatoes and Onions with Spicy Brown Mustard and Garlic

Delicious!  And easy and simple!  Enjoy!
-3 lbs potatoes, peeled and cut into large chunks
-2 small onions, peeled, halved and sliced
-4 garlic cloves, sliced
-4 Tbs extra virgin olive oil
-3 Tbs spicy brown mustard
-2 tsp salt
-2 tsp pepper
Preheat the oven to 425 F.  Coat a baking sheet with cooking spray.  Top with the potatoes and onions.  Add the remaining ingredients and mix, using your hands.  Mix well, then spread evenly in single layer.
Roast in preheated oven for 45-50 minutes, stirring once about halfway through.
Once golden brown, adjust the seasoning with salt and pepper, if necessary.  Enjoy!