Start by preheating your oven to 180°C (350°F). Line a baking tray with parchment paper. This prevents sticking and helps cookies bake evenly.

In a mixing bowl, beat butter, sugar and brown sugar together. Mix until light and fluffy. This step helps create soft and tender cookies.

Add the egg and vanilla extract to the mixture. Beat again until smooth. The batter should look creamy and well combined.

In another bowl, mix flour, baking soda, cream of tartar, salt and cinnamon. Stir well so everything is evenly combined.

Slowly add the dry mixture into the wet mixture. Stir gently until a soft dough forms. Do not overmix to keep cookies soft.

Fold in the chopped apple pieces. Make sure they are evenly spread in the dough. This adds moisture and natural sweetness.

Take small portions of dough and roll into balls. Mix cinnamon and sugar in a bowl. Roll each dough ball in this mixture for coating.

Place the dough balls on the baking tray. Leave space between each one. Bake for 10–12 minutes until edges are golden and centers stay soft.

Remove from the oven and let them cool for a few minutes. Transfer to a plate and serve. Enjoy soft, warm cookies with a hint of apple and cinnamon.