Preheat the oven to 350°F. Grease a muffin tin.
Blend the freeze dried strawberries into a fine powder either in a food processor, or by sealing it in a Ziplock bag and smashing it with something heavy, like a rolling pin.
In a large mixing bowl, whisk together the flour, salt, baking powder, baking soda, and freeze dried strawberry powder. Set aside.
In a large mixing bowl with an electric hand mixer, beat the softened butter and granulated sugar for about 3 minutes, until it is fluffy. Add the eggs one at a time, mixing after each addition. Add the vanilla extract, and mix again to combine. Set aside.
In a small mixing bowl, whisk together the homemade buttermilk and Greek yogurt.
Add about one-third of the dry mixture to the butter and sugar. Mix until there's no dry flour visible. Add about one-third of the milk and yogurt mixture. Mix again until it's fully combined. Continue alternating between adding the dry and wet ingredients, mixing after each time.
Divide the batter evenly into the muffin/cupcake tin. Fill your cupcake tins about ⅔ to ¾ full. If you fill them completely full, they'll overflow as they rise in the oven.
Bake for about 20 to 25 minutes, until a toothpick comes out clean. Let the cupcakes cool for five minutes in the cupcake tin, then remove them and set them on a wire cooling rack to cool to room temperature.