This Chocolate Chip Cake is soft, buttery, and loaded with chocolate chips, then topped with a fluffy brown sugar buttercream and rich chocolate fudge swirl.
1 ½cupssemisweet chocolate chipstossed in 1 tablespoon flour
Vanilla Brown Sugar Buttercream
1 ½cupsunsalted buttersoftened
½cuplight brown sugarvery finely packed
4cupspowdered sugar
1tablespoonvanilla extract
2-4tablespoonsheavy cream
1Pinchof salt
Warm Fudge Swirl
½cupsemisweet chocolate chips
2tablespoonsbutter
2tablespoonscorn syrup or honey
¼cupheavy cream
Instructions
Make the Browned Butter Base
In a small saucepan, cook the butter over medium heat until the milk solids turn golden and it smells nutty. Don’t over cook. Cooking until golden will add some flavor but if you over cook it, the butter will become bitter.
Remove from heat and cool for 10 minutes — it should be pourable but not hot.
Mix the Cake Batter
Preheat the oven to 350°F.
Grease pans. You can use butter but I used a butter flavored spray and it worked well.
Using a mixer with the flat beater attachment, combine browned butter, granulated sugar, and brown sugar. Beat on medium speed until creamy, 2–3 minutes.
Add eggs one at a time. Using slow speed, mix well.
Add vanilla and yogurt. Using slow speed, mix until combined.
In a separate bowl, add flour, baking powder, baking soda, and salt. Whisk or sift to combine.
Alternate adding dry ingredients and milk into the batter, mixing on low until just combined. I mix until about ¾ combined.
Fold in chocolate chips. Mix until barely combined, don’t over mix.
Bake
Spread batter into pan(s).
Bake 28–34 minutes for a 9x13 or 22–26 minutes for round pans, until lightly golden and a toothpick comes out clean.
Cool fully before frosting.
Make the Brown Sugar Buttercream
Using a mixer with the flat beater attachment, beat butter and brown sugar together for 3–4 minutes until whipped and smooth.
At slow speed, add powdered sugar gradually. I add about 1 cup at a time.
Mix in vanilla and salt.
Add heavy cream 1 tablespoon at a time until fluffy and spreadable.
Make the Warm Fudge Swirl
Melt chocolate chips, butter, and corn syrup together over low heat. You can also do it in the microwave but only at 10 second intervals until it starts to melt. If you do it longer the chocolate will burn.
Stir in heavy cream to make a glossy fudge.
Let cool slightly. It should be pourable but not hot. If it is hot or even too warm it will melt the frosting.
Frost & Swirl
Spread a thick layer of buttercream over the cooled cake.
Drizzle spoonfuls of warm fudge around the surface.
Use a spatula to gently swirl, creating ribbons (do not fully mix).
Sprinkle extra mini chocolate chips on top. (optional)
Notes
Toss the chocolate chips with flour before mixing into the batter.
Brown the butter until golden and fragrant, not dark brown.
Do not overmix the batter after adding the flour.
Let the fudge cool slightly before swirling into the frosting.
Internal temperature should reach about 160°F for doneness.