Pumpkin Muffins II

2 cups flour
2 cups brown sugar
2 tsp cinnamon
1/2 tsp salt
2 tsp baking soda
1 cup beg oil
16 oz canned pumpkin
4 eggs
2 cups chocolate chips
walnuts (opt)

Bake 350. Mini-muffins: 12-13 minutes, regular: 22-25 minutes