The Apple Cinnamon Whole Wheat Muffins

This is a recipe I got from a friend, who got it from a friend, etc.  They're so delicious that picky eater Little T begs for them.  My friend usually brings them to the park for play group every week and T has started asking her for them.  So this is a recipe I really need to remember.

1 cup whole wheat flour
1 cup whole oats
1 1/4 cup milk
1 tsp white vinegar (or lemon juice)
1 egg
½ tsp. salt
½ tsp. baking soda
1 tsp. baking powder
1/3 cup vegetable oil
1/3 cup brown sugar
one or two mashed bananas optional
(I diced up 2 green apples instead of bananas and added 2 tbs cinnamon)
Mix by hand combining all ingredients.
Bake at 425⁰ for 10 minutes.
Makes 24 mini muffins.

SO. SO. GOOD