Peel your potatoes and cut them into 1-inch pieces. Place them in a saucepan an fill it with water, about one inch over the potatoes. Bring the pot to a boil, reduce the heat to medium-low, cover the pot, and let the potatoes simmer for 15-20 minutes or until they're tender.
While the potatoes boil, combine the breadcrumbs, Parmesan cheese, and olive oil in a small bowl. Mix well to combine and set the Parmesan breadcrumbs aside.
Preheat the oven to 350℉ and set the rack to the middle position. Spray an 8 x 8 inch casserole dish with cooking spray and set it aside.
When the potatoes are tender, drain them well in a colander.
Return the potatoes to the pot and mash them well with a potato masher. Add the Boursin cheese, Greek yogurt, milk, salt, and pepper. Mix well with a spatula to incorporate the ingredients. Taste and add extra salt if needed.
Transfer the mashed potatoes to the prepared casserole dish. Sprinkle the breadcrumbs over the top and then the chives.
Bake for 30 minutes or until the crumbs are golden and the potatoes are hot.
Notes
To prepare this recipe ahead, add an extra 3 tablespoons of milk to the mashed potatoes. Refrigerate the casserole and let it sit at room temperature while the oven preheats. You may need to add an extra 5-10 minutes to the bake time.Keep leftovers in the refrigerator for up to 3 days.