First start by combining your flour, baking powder, unsweetened cocoa powder, salt and sugar in a bowl. Whisk the ingredients together to remove any lumps from the cocoa powder and flour.
Next, in a stand mixer or bowl using a hand mixer, combine the vegetable oil, eggs, milk and vanilla extract. Mix together until well combined.
Make yourself a hot cup of coffee. You can brew a cup or use instant coffee. Just make sure it’s hot.
Add your flour and cocoa powder mixture to the wet ingredients about 1/4 cup at a time so you don’t end up in a cloud of flour dust. Continue mixing as you pour in your dry ingredients. Scrape the sides of the bowl as needed.
Next, add in the semi-sweet chocolate chips and fold them into the chocolate cake batter with a spatula.
Pour in the cup of hot coffee. The cake batter will look very wet and that’s completely normal. Simply mix until the coffee has dissolved into the batter.
Spray the inside of the crockpot with baking spray to prevent the cake batter from sticking. Pour the chocolate cake batter into the crockpot.
Place a paper towel on top of the crockpot and close the lid. The paper towel is there to catch condensation.
Cook on high for 2.5-3 hours or until a toothpick inserted down the middle comes out dry. Alternatively, you can cook on low for 5.5-6 hours.
Finally, turn the crockpot off and let the cake cool down for about 30 minutes. Serve with vanilla ice cream and enjoy!