Set your oven to 350ºF and line a baking sheet with parchment or lightly grease.
Cream together the butter and brown sugar until smooth. Beat in the egg and vanilla.
Whisk together flour, baking soda, powder, salt and spices. Add the flour mixture a quarter at a time to the butter mix, beating on low speed after each addition.
Gently stir in oats, apple, and toffee bits.
Place dough by tablespoons on the cookie sheet, about 1 1/2″ apart. Bake for 8-10 minutes or until the edges are light brown, the centers are set but still rather soft and pale.
Allow to cool a minute on the sheet, then remove cookies to cool completely on racks.