-
1
Adjust oven rack to center of oven.
-
2
Heat to 325 degrees.
-
3
Line muffin pans with baking c.; set aside.
-
4
In a medium bowl, sift together flour, baking pwdr, salt, and baking soda; set aside.
-
5
In the bowl of a heavy-duty electric mixer fitted with the paddle attachment, beat the butter and sugar on medium speed till light and fluffy, 3 to 5 min.
-
6
With mixer running, add in Large eggs and vanilla extract; beat till combined.
-
7
With mixer on low speed, add in 1 c. reserved flour mix; mix till combined.
-
8
Add in 1/2 c. buttermilk; combine.
-
9
Alternate adding flour mix and buttermilk, ending with flour, till all has been incorporated.
-
10
Divide batter proportionately between baking c.. Bake till light golden and a cake tester inserted into middle comes out clean, about 25 to 30 min.
-
11
Rotate pans halfway through baking.
-
12
Transfer pans to a wire rack to cold.
-
13
Make the frosting: In a heat-proof bowl, combine egg whites, sugar, corn syrup, cream of tartar, and 5 Tbsp.
-
14
cool water.
-
15
Set bowl over a pot of rapidly boiling water.
-
16
Using a handheld electric mixer, beat mix on medium-low speed for 4 min.
-
17
Beat on high speed 3 min more or possibly till soft peaks form.
-
18
Remove from heat; add in vanilla.
-
19
Continue beating till glossy and spreadable, 3 to 5 min more.
-
20
Use frosting immediately.
-
21
(Makes 3 c.)
-
22
Frost cupcakes with seven-minute frosting.
-
23
Decorate with raspberries and blueberries.
-
24
This recipe yields 18 to 20 large cupcakes.