The lemon zest brightens this wonderful muffin. The swirl is made by cooking down half of the blueberries into a sweet syrup. The remaining blueberries create a great texture. This recipe will go into your weekend breakfast rotation.
Whisk remaining 1 1/4 cups of sugar and eggs in a medium bowl until thick, about 45 seconds.
Bake until muffin tops are golden and just firm. 17-19 minutes, rotating halfway through.
Cool in tin for 5 minutes before transferring to a wire rack.