Preheat oven to 375°. Spray the muffin tins with non-stick spray.

Sift together the flour, salt, and baking powder

Using a mixer mix the peanut butter, butter and brown sugar until they are combined and smooth. Add in the eggs, one at a time and the milk. Continue to mix until everything is incorporated.

Slowly mix in dry ingredients until just combined. Fold in the toffee pieces and chocolate chips with a spoon.

Spoon mix into muffin tins. Bake for 15-20 minutes or until a toothpick can come out clean.