Ingredients

2 tablespoons extra-virgin olive oil, plus more for drizzling 

1 onion, chopped 

1 stalk celery, thinly sliced 

1 carrot, peeled and thinly sliced 

2 pounds Yukon Gold potatoes, peeled and cut into 1-inch chunks 

2 cups cooked white beans, drained (equivalent to one 16-ounce can) 

Coarse salt and freshly ground pepper 

Preparation

Heat oil in a medium saucepan over medium heat. Cook onion, celery, and carrot until translucent, 6 to 8 minutes. Add potatoes and white beans and cover with water by 2 inches. Season generously with salt. Bring to a boil, then reduce heat and simmer until potatoes are tender, about 8 minutes. Drain, reserving about 1 cup cooking water.

Mash vegetables, adding reserved water to adjust consistency. Season with salt and pepper and drizzle with oil before serving.