COOKIES - Combine flour, salt, baking powder and baking soda in a medium sized dish. Set aside.
Put butter and sugar in a large dish. Mix it with electric mixer on lower speed for about a minute.
Add an egg and mix some more, until well combined.
Add Greek yogurt and vanilla and mix until it becomes creamy.
Combine it well with dry ingredients. Leave it for 1h to rest.
Preheat oven to 375°F. Line baking pan with parchment paper. Put pieces of dough in the pan, using spoon and arrange them to leave 1 to 2 inches of space between them. Bake for 8-10 min, until the edges become brown. Let them cool on wire rack.
FROSTING - Combine powdered sugar, whipping cream and vanilla extract in a medium sized dish. Mix well until the mixture becomes smooth.
Put frosting on top of completely cool cookies by spreading ½ a spoon of frosting on ½ of a cookie.
Decorate with chopped cranberries right away, while frosting is still soft.
Notes
Serve fresh or keep at a room temperature for a couple of days.