The oiginal recipe is from Baking Bites.
Streusel Topping
1/3 c. brown sugar
1/2 t. cinnamon
2 T. butter
1/2 c. chopped walnuts
Mix until coarse crumbs.
Apple Muffin
1 1/2 c. flour
1/2 t. baking soda
1 t. baking powder
2/3 c. brown sugar
1/2 t. salt
1/3 c. oil
1 egg
1/2 c. buttermilk (I use milk with a dash of white vinegar)
1 t. vanilla
2/3 c. grated apple (2 small)
These are general instructions for making all types of muffins: Mix wet ingredients (including the grated apple in this case). Mix all dry ingredients. Gently fold the dry ingredients into the wet just until moist.
Fill muffin cups 2/3 full. Top with streusel topping and bake at 350 for 15-18 minutes.
The first time I made these, we didn't have any walnuts. Butter and brown sugar on top = yum!