Sweet Potato Casserole

2 cups of stevia
1 eggs
4 tablespoon of butter (or 2 of butter and 2 of coconut oil)
1/2 cup of milk
1/2 teaspoon of vanilla

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 1/2 cup of brown sugar
1/3 cup of flour
3 tablespoon of  butter
1/2 cup of chopped pecans

30 minutes in 325o.F