Step 1

Pre-heat the oven to 180 C / 350 F.

Step 2

Line an 8-inch square tin with baking paper, making sure you cover the sides.

Step 3

Break up the chocolate into pieces and place in the Thermomix bowl. Cut the butter into cubes and add to the Thermomix bowl.

Step 4

Melt the chocolate and butter for 4 minutes / 50 degrees / speed Check that the chocolate is melted. If not repeat for a further 2 minutes.

Step 5

Add sugar to the bowl. Mix 10 seconds / speed 4.

Step 6

Add eggs and vanilla extract to the bowl. Mix 5 seconds / speed 4.

Step 7

Add flour and cocoa powder to the bowl. Mix 30 seconds / speed 4.

Step 8

Add chocolate chips to the bowl. Mix on REVERSE / 10 seconds / speed 4.

Step 9

Smooth the mixture into the prepared baking tin. It should be thick and fudgy. Bake in the oven at 180 C / 350F for 25 minutes.

Step 10

Allow to cool in the tin before cutting into squares and serving.