CHOCOLATE CAKE WITH GANACHE AND PRALINE TOPPING

Steps:

• For cake:
• Preheat oven to 350°F. Spray 9-inch cake pan with nonstick spray. Line with parchment. Spray parchment. Dust with flour, tapping out any excess.
• Place butter and cocoa powder in medium bowl. Pour 1/2 cup boiling water over; stir. Let stand 2 minutes; whisk until blended. Whisk flour, sugar, baking soda, and coarse salt in another medium bowl. Whisk buttermilk, egg, and vanilla in large bowl. Gradually whisk cocoa mixture into buttermilk mixture; whisk until smooth. Add flour mixture in 3 additions, whisking to blend between additions (batter will be thin). Pour batter into prepared pan.
• Bake cake until tester inserted into center comes out clean, about 30 minutes. Cool in pan 10 minutes. Run knife around pan edges to release cake. Invert onto rack; remove pan and parchment. Cool completely.
• For ganache:
• Place chocolate and cream in microwave-safe bowl. Heat in microwave in 15-second intervals, stirring occasionally, until melted and smooth. Stir in butter. Let stand until spreadable, about 30 minutes. Spread over top and sides of cake. Transfer cake to plate. Chill 2 hours and up to 1 day.
• For praline:
• Stir first 3 ingredients in heavy large saucepan over medium-high heat until butter melts. Boil 1 minute without stirring. Remove from heat; whisk in sugar and vanilla. Add pecans; stir just to incorporate. Quickly pour praline over cake. Spread just to edges (topping sets quickly). DO AHEAD: Can be made 1 day ahead. Cover with cake dome. Store at room temperature.