Swedish Sticky Chocolate Cake

Ingredients

1/2 cup all-purpose flour
1/4 cup unsweetened cocoa powder
1 pinch salt
2 eggs
1 1/3 cups white sugar
1 tablespoon vanilla extract
1/2 cup butter,

Source-https://www.allrecipes.com/recipe/75135/swedish-sticky-chocolate-cake-kladdkaka/?internalSource=staff%20pick&referringId=231&referringContentType=recipe%20hub

I followed the instructions exactly as written and it did not turn out. I cooked it until the top was way more than "just set" and it was still raw on the inside