Brown Sugar Cake with Toffee Streusel

1 . Stage

Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking pan and set aside.

2 . Stage

Combine flour, sugar, brown sugar, baking soda, and 1/2 teaspoon salt in the bowl of an electric mixer. Stir until well blended. Cut in butter with a pastry knife or fork until the mixture resembles coarse meal. Set aside 1/2 cup of the mixture.

3 . Stage

Whisk buttermilk, egg, and vanilla extract until the egg is well incorporated. Add buttermilk mixture to the mixer bowl and mix on medium speed, 4 to 5 minutes. Scrape down the sides of the bowl, if necessary. Pour batter into the prepared pan.

4 . Stage

Stir together reserved flour mixture, mini chocolate chips, English toffee bits, pecans, and remaining salt in a small bowl until well mixed. Sprinkle toffee streusel evenly over the cake batter.

5 . Stage

Bake in the preheated oven until a toothpick inserted into the center comes out clean, 30 to 35 minutes. Cool in the pan on a rack, about 10 minutes. Serve warm or at room temperature, directly from the baking pan.