📝 Instructions:

Step 1: Bake Cake

1. Preheat oven to 350°F (175°C). Grease and flour a Bundt pan.

2. In a medium bowl, whisk flour, baking powder, baking soda, and salt.

3. In a large bowl, cream butter and sugar until light and fluffy. Beat in eggs one at a time, then add vanilla.

4. Alternate adding dry ingredients and milk with sour cream, mixing until smooth.

5. Pour batter into prepared Bundt pan and bake 50–60 minutes, or until a toothpick comes out clean. Cool completely.

Step 2: Prepare Custard Filling

1. In a medium saucepan, heat milk until just simmering.

2. In a bowl, whisk sugar, cornstarch, and egg yolks until smooth.

3. Gradually pour hot milk into the egg mixture, whisking constantly, then return to the saucepan.

4. Cook over medium heat until thickened, stirring constantly. Remove from heat and stir in butter and vanilla. Cool slightly.

Step 3: Fill Cake

1. Once cake is cooled, carefully slice horizontally or use a piping bag to fill the center with custard.

Step 4: Make Chocolate Glaze

1. Heat cream until simmering, then pour over chopped chocolate. Let sit 2 minutes, then stir until smooth. Stir in vanilla.

2. Drizzle glaze over the top of the cake, letting some drip down the sides.