Preheat oven to 350°F. Line a 12-cup muffin pan with paper or foil cupcake liners.
Peel, quarter and core apples and cut into 1/3-inch dice. Melt butter in a medium skillet over medium heat. Add apples; cook for about 5 minutes. Remove from heat; stir in brown sugar and salt. Let cool for 5 minutes.
In a bowl, whisk together flour, walnuts and baking soda. In another bowl, beat together egg and vanilla extract. Stir apple and egg mixtures into flour. Spoon batter into cupcake liners about three-quarters full.
Bake for 18 to 20 minutes. Let cool for 15 minutes. Remove from pan to racks to cool completely. Dust with confectioners' sugar before serving.
I made these today and couldn't believe there were no spices. And I made fifteen not twelve. I made a few changes due to personal preference. I added 1/2 a cup of whole wheat flour, a teaspoon of cinnamon, and a 1/4 teaspoon of nutmeg. Hubby requested apple crumb cake last night, but since there's only two of us I do a lot of cakes as cupcakes because it makes it easier to freeze in convenient packages. I'm not sure how they taste cause I haven't tried them yet, so I'll post again after trying one.
I made these muffins yesterday afternoon, and already there are only 4 left ( hubby ate 4 last night after I went out, and I took some with me to a friend). I followed the recipe to the letter, only excluding the nuts due to family allergies. I like the flavor of the muffins, but they werent the texture I'd hoped for. I will try them again, since they call for common pantry ingredients we always have on hand. Thinking next time I will add some sour cream to the batter and also maybe a pinch of either cinnamon or nutmeg to the apples&brown sugar before it is incorporated into the dry ingredients. ALso, instead of using confectioner's sugar, I will likely sprinkle some finishing sugar or turbinado atop the muffins before baking for added crunch and texture
I made the recipe times three and in doing so eliminated a third of the sugar. Thought maybe I could do that with the butter, too, but no. I added in another stick of butter at the last minute. I also used apples with their peels as well as apples that were on their way out. Turned out really good. Definitely a "crumble", probably especially because I reduced the sugar. But it worked. A great recipe for using up fruit from a big warehouse store purchase.