This recipe is adapted from the wonderful recipe I found here.
For the cakePreheat oven to 350°F with rack in middle. Butter an 8-inch square cake pan and line with a square of parchment paper, then butter parchment. Sift together flour, baking powder, baking soda, and salt.
2 cups plus 2 tablespoons sifted cake flour (not self-rising; sift before measuring)
1 teaspoon baking powder
3/4 teaspoon baking soda
1/2 teaspoon salt
1 stick unsalted butter, softened
1 cup sugar
1 teaspoon pure vanilla extract
2 large eggs, at room temperature 30 minutes
1 cup well-shaken buttermilk
Beat butter and sugar in a large bowl with an electric mixer at medium speed until pale and fluffy, then beat in vanilla. Add eggs 1 at a time, beating well after each addition. At low speed, beat in buttermilk until just combined (mixture may look curdled). Add flour mixture in 3 batches, mixing until each addition is just incorporated.
Spread batter evenly in cake pan, then rap pan on counter several times to eliminate air bubbles. Bake until golden and a wooden pick inserted in center of cake comes out clean, 35 to 40 minutes. Cool in pan on a rack 10 minutes, then run a knife around edge of pan. Invert onto rack and discard parchment, then cool completely, about 1 hour.
For caramel glazeBring cream, brown sugar, corn syrup, and a pinch of salt to a boil in a 1 1/2-quart heavy saucepan over medium heat, stirring until sugar has dissolved. Boil until glaze registers 210 to 212°F on thermometer, 12 to 14 minutes, then stir in vanilla.
1 cup sweetened condensed milk
1/2 cup packed light brown sugar
1 tablespoon light corn syrup
1 teaspoon pure vanilla extract
Put cake in a shallow baking pan and pour hot glaze over top of cake, allowing it to run down sides. Cool until glaze is set, about 30 minutes.
The blog post that goes with this recipe can be found here.
Peace,
Milton