**Maple Cupcakes**
- 3 cups AP flour
- 3 tsp baking powder
- 1 tsp salt
- 1/2 cup (1 stick) butter, slightly softened, cut into chunks
- 2 Tbsp vegetable shortening, room temperature
- 2 cups pure maple syrup (grade B preferred)
- 3 egg yolks
- 1 large egg
- 1 1/4 cups whole milk
- 1 cup walnuts, toasted and coarsely chopped