Preheat oven to 350 degrees F.

Using electric mixer, cream butter and sugar together for a few minutes at medium speed using paddle.

Add Greek yogurt and vanilla extract to butter and sugar mixture in mixer. Cream together for 1 to 2 minutes at medium speed.

Add eggs to mixture and beat together for about 3 minutes.

Combine dry ingredients in medium mixing bowl: flour, baking soda, baking powder, and salt.

Slowly add dry mixture to mixer on low speed until all ingredients are evenly combined.

Scoop mixture into medium mixing bowl. Seal and place in refrigerator overnight.

Remove from refrigerator. Scoop out one fist-sized ball at a time and place onto parchment paper. Knead with hands. Sprinkle flour onto rolling pin and dough as needed to avoid sticking. Use rolling pin to flatten dough evenly.

Using all 4 of the fall leaf cookie/fondant cutters, begin to cut each shape into the dough as many times as possible. Do NOT press down on spring button.

Place all of the fall leaf shaped cookies onto baking sheet. Bake at 350 degrees F for 5 minutes per batch.

Remove from oven. Let cool for approximately 5 minutes.

Knead yellow fondant in hands for a few minutes. Use fondant roller or regular rolling pin to flatten into a thin layer. Using the same fall leaf shapes, begin to cut as many leaves as possible from the fondant. Be sure to press down on the spring button when cutting each shape, this will create 3-dimensional detailing and indentations for your leaves.

Repeat step 12 for the orange fondant.

Using the orange sparkle gel, begin to fill the indentations. Do this to about half of the sugar cookies. Add fondant leaf cutouts to each cookie and press down gently to secure.

Serve and enjoy!