Place 1 ½ cups of cheddar cheese in a microwave safe bowl and microwave in 15 second intervals, stirring in between, until smooth and pliable.
Scoop the cheese into the mold, pressing and spreading into the bottom. You don’t want to fill the entire mold - just the Han Solo indentations and enough to cover the entire rectangle.
Microwave for 15 seconds then tap on the counter. Freeze until solid at least 1 hour.
Carefully remove the cheese from the mold and set aside in the fridge.
Make the savory cake:
Preheat the oven to 350 degrees F. Line a 7x11 inch cake pan with parchment paper and spray with nonstick spray.
Combine the Bisquick, milk, sugar, egg, and salt in a large bowl and beat with an electric hand mixer until combined.
Add the Gruyere cheese, sautéed onion, ham, and chives and fold with a spatula to combine.
Pour the mixture into the prepared cake pan and bake until lightly golden brown, about 30-35 minutes or until a toothpick comes out clean.
Let the cake cool completely in pan. Meanwhile, take the Han Solo cheese garnish out of the fridge and let come to room temperature.
Run a small offset around the edges of the cake and invert onto a cutting board. Remove parchment paper and then invert again. If needed, level the top of the cake with a serrated knife.
Place the cheese garnish on top of the cake and trim the cake with a serrated knife so that the cake and cheese have the same dimensions.
Set the cheese garnish aside and spread the softened butter over the top of the cake.
Place the cheese on top of the butter, pressing to adhere.
Transfer the cake to a platter and serve with more ham and butter.
NOTE: Find the Han Solo Carbonite mold on Amazon https://www.amazon.com/dp/B008MWA47C/ref=asc_df_B008MWA47C5433421/?tag=hyprod-20&creative=395033&creativeASIN=B008MWA47C&linkCode=df0&hvadid=241969147179&hvpos=1o1&hvnetw=g&hvrand=8305212910512134706&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9004065&hvtargid=aud-441392016954:pla-396230580849.