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Lemon, Rosemary & Thyme Cupcakes with Lemon-Mascarpone Cream

Some cupcakes are sweet for the sake of being sweet. These ones have something to say. The lemon does the loud part — bright, tart, unmistakable — and the rosemary and thyme do the quiet part, hanging in the background until someone takes a second bite, tilts their head, and asks what is that. That little pause is the whole point.

The frosting is where this recipe really earns its keep. No powdered-sugar buttercream, no cream-cheese frosting that turns to soup the second the room gets warm. Just cold mascarpone loosened with a generous spoonful of lemon curd and a whisper more of the herbs. It's pipeable, it holds its shape, and it tastes like the inside of a lemon tart. If you've ever taken a tray of cupcakes to a cookout and watched the frosting slide right off, this is the answer.

Why these work

• Bloomed herbs. Stirring the rosemary and thyme into the milk first — even just for a couple of minutes — pulls their oils into the liquid so the flavor reads through the whole crumb instead of in stray pockets.
• Lemon juice in last. Adding it after the batter is mixed keeps the acid from fighting the leavening and gives you the cleanest lemon flavor.
• Mascarpone, not buttercream. Lighter, tangier, and stable in heat thanks to the lemon curd's pectin. It's the secret to a frosted cupcake that still looks like a frosted cupcake at hour three.

Ingredients

For the cupcakes

• 3½ cups all-purpose flour
• 1 Tbsp baking powder
• 1 tsp fine salt
• 1 cup (2 sticks) unsalted butter, softened
• 2¼ cups granulated sugar
• 3 large eggs + 1 egg white, at room temperature
• 1 cup whole milk, at room temperature
• 2 tsp vanilla extract
• Zest of 1 lemon
• Juice of 2 lemons (about ¼ cup)
• 1 Tbsp finely chopped fresh rosemary
• 1 Tbsp finely chopped fresh thyme

For the lemon-mascarpone frosting

• 2½ cups (about 20 oz) mascarpone, cold
• 1 cup lemon curd
• 4 tsp finely chopped fresh rosemary
• 2 tsp finely chopped fresh thyme

Method

Cupcakes

1. Heat the oven to 350°F. Line two 12-cup muffin tins with paper liners.
2. Whisk the flour, baking powder, and salt in a medium bowl. Set aside.
3. Stir the milk, vanilla, lemon zest, rosemary, and thyme together in a measuring cup and let the herbs steep while you cream the butter — even a couple of minutes makes a noticeable difference.
4. Beat the butter and sugar on medium-high for a full 3–4 minutes, until pale and fluffy. This is the only place the cupcakes get any real lift, so don't cut it short.
5. Add the eggs one at a time, then the egg white, beating just until each disappears. Scrape the bowl.
6. On low speed, add the flour in three additions, alternating with the herbed milk in two: ⅓ flour, ½ milk, ⅓ flour, ½ milk, ⅓ flour. Stop the moment the last of the flour disappears — overmixing is what makes cupcakes tough.
7. Stir the lemon juice in by hand. If the batter looks a little broken or speckled, that's expected.
8. Scoop into the liners about ¾ full — a #20 disher is just right.
9. Bake 18–22 minutes, rotating the pans at the 12-minute mark. They're done when the tops spring back lightly and a toothpick comes out with a few dry crumbs.
10. Cool 5 minutes in the tins, then transfer to a rack and let them go fully cold before you even think about frosting.

Frosting

1. In a clean bowl, whisk the cold mascarpone on medium just until smooth — 20 to 30 seconds. Stop right there. Whipped too long and it breaks.
2. Add the lemon curd, rosemary, and thyme. Beat another 15–20 seconds on medium-low, just until it's streak-free.
3. If it's at all soft, chill it for 15 minutes before piping. A large round tip or an open star both look beautiful.

Notes & make-ahead

• Chop the herbs fine. Long pieces feel like grass. If your rosemary is a little woody, run your knife through it twice.
• Curd matters. A thicker lemon curd makes a sturdier frosting. If yours is loose, fold in 2–3 Tbsp powdered sugar to firm it up.
• Storage. Unfrosted cupcakes keep at room temp, covered, for a day, and freeze well for a month. Frosted cupcakes need the fridge (mascarpone) and are best within 24 hours. Let them come back toward room temp 20 minutes before serving so the crumb softens.
• Scaling down. Halve everything for 12 cupcakes; use 2 whole eggs and skip the extra white.

For more recipes that bring a little something extra to the table, visit EdieOeats.com.