Start by crushing the large graham cracker rectangles in a food processor or by placing them in a sealed bag and using a rolling pin. Aim for fine crumbs, then transfer them to a bowl. Combine the crushed graham crackers with melted butter, mixing well until the crumbs are evenly coated. This will form the base for your Sweetened Key Lime Pie Popsicles.

In a medium bowl, whisk together the plain Greek yogurt, honey, freshly squeezed key lime juice, and lime zest until smooth and well combined. Look for a creamy consistency, ensuring there are no lumps. This flavorful mixture serves as the filling.

Begin layering the popsicle molds by spooning in the yogurt mixture, filling them about halfway. Be sure to leave some space at the top for the graham cracker layer. Next, take your prepared graham cracker mixture and press it down firmly on top of the yogurt in each mold.

Insert popsicle sticks into the molds, ensuring they are centered and upright. Place the filled molds in the freezer and allow them to freeze for at least 3 to 4 hours, or until they are completely solid.