Drain potatoes and cube 1/3 cup butter.

Place both in large microwavable bowl and heat until butter is melted.

Mash potatoes and add sugar and salt.

Beat eggs and add vanilla and 2 tsp flour. Mix thoroughly.

Grease casserole dish and pour in potato mixture.

Mix 1/3 cup flour, 1/3 cup butter and brown sugar by hand with fork until crumbly.

Add pecans, and pour over potatoes.

Bake for 35 min at 350°F.