Preheat the oven to 350F then line a baking sheet with aprchement paper and set aside.
Cream the butter, granulated sugar, and brown sugar together until light and fluffy. Add in the egg, lemon juice, lemon zest, and lemon extract and mix until combined.
Gently mix in the flour, baking soda, and salt until the flour mixture disappears. don't overmix so that your cookies stay soft and chewy.
Scoop out 8 equally sized cookie dough balls then place them on a plate or baking sheet and freeze for 15 minutes.
Bake the cookies in the preheated ovenfor 10-11 minutes, once they come out swish them around with a larger cookie cutter to keep them thick and round. Then let them cool down for 10 minutes on the baking sheet before transferring them to a cooling rack.
Make the butter lemon glaze
Melt the butter, powdered sugar, lemon zest, and lemon juice in a small sauce pan stirring constantly until the sugar dissolves.
Glaze the cooled down cookies using a pastry brush, then top with a lemon slice and enjoy!
Notes
How to store glazed lemon sugar cookies?
You can store these cookies in an airtight container at room temperature for up to 4 days. Make sure not to top them with the lemon slices until you're ready to serve to keep the cookie from getting too wet.You can also store these cookies in an airtight container in the fridge for up to 7 days. Let them get back to room temperature before enjoying them.