Preheat the oven to 350. Peel and chop your apples into bite sized pieces. Add them to a bowl with cinnamon and toss to combine.
In a stand mixer or large bowl, combine the butter, white sugar, and brown sugar. Mix for 2 minutes until the butter is completely mixed.
Add eggs, greek yogurt, and vanilla and mix again. Add flour, cream of tartar, baking soda, and salt. Mix until all dry ingredients are combined.
Using a large cookie scoop, or your hands, get 1/4 cup of dough and create a cavity in it. Pour a spoonful of cinnamon apples into the cavity and close the dough around them. Roll the ball in your hands until it is smooth.
Transfer the dough balls to a lined baking sheet. Slightly flatten each dough ball. Now make the streusel.
Combine the brown sugar, oats, softened butter, flour, cinnamon, and salt in a bowl and mix. The mixture will stick together somewhat, but should crumble when run through your fingers.
Add about 2 tbsp of streusel on top of each cookie. Bake at 350 for 9-12 minutes.
To make the frosting, add the powdered sugar and maple syrup to a bowl and whisk. If the icing is still too thick, add a splash of milk. When cookies are mostly cooled, drizzle with maple icing!
Since these cookies have fresh apples, they are enjoyed best the first or second day! Enjoy!
