Prep Time 20 minutes mins
Cook Time 18 minutes mins
Resting Time 30 minutes mins
Total Time 1 hour hr 8 minutes mins
For best flavor and texture, ensure all refrigerated ingredients are at room temperature before mixing so the batter emulsifies properly and bakes evenly; avoid overmixing once the flour is added to keep the crumb tender, and if the swirl mixture feels too runny, let it sit a few minutes to thicken slightly so it doesn’t sink to the bottom. You can adjust the cinnamon level to taste, adding a bit more for a stronger spice note or reducing it for a milder cupcake. If you don’t have piping bags, snip the corner of a zip-top bag to pipe the frosting, or simply spread it with a knife. Store the cupcakes in an airtight container at room temperature for up to 2 days, or refrigerate for longer storage, letting them come to room temperature before serving for the softest texture.