Pre-heat oven to 350 F. Butter a 9-inch square cake pan.
Cream butter, sugar and key lime zest together until light and creamy, about 3 minutes. (by hand with a wooden spoon or using an electric mixer)
Add the eggs one at a time, fully incorporating.
Mix together the flour, baking powder, baking soda and salt in medium-sized bowl.
Add half the flour mixture to the creamed, mixing just enough to incorporate.
Add Greek yogurt, mixing in just enough to incorporate.
Add the remaining flour mixture, mixing just enough so it’s barely incorporated.
Scrape the batter into the prepared baking pan.
Bake for 55-60 minutes at 350 F.
Or until the buckle is lightly browned on top and feels just set in the center. It should spring back lightly when you touch the center.
Remove the buckle from the oven chill at room temperature. Make a crumb from the biscuit, put half in a mold, put cherries on top add the remaining crumb biscuit.
Make the syrup by heating the key lime juice and sugar in a small saucepan over medium heat, cooking it until it thickens. It should take about 5 minutes. Don't allow the syrup to brown.
And pour the warm key lime syrup over it, letting it soak in.
Put buckle in the oven for 10 minutes.
Serve buckle slightly warm, garnished with almond.