Creamed Potatoes and Peas

3-4 lg. potatoes, peeled, diced, and cooked
2 c. frozen peas, cooked
1-2 c. carrots, cooked (optional)...but highly recommended :)
1/4 c. butter
3/4 c. flour
2 1/2 c. milk (can add more milk if too thick)
Salt and pepper to taste

Drain potatoes, carrots, and peas, combine in bowl. Melt butter in saucepan, and flour, milk, salt and pepper. Heat and stir until thick and smooth. Stir into potatoes and peas. Serves 4.