Something that is similar to a lava cake but made in one 8x8 square pan (for the family) rather than individual ramekins since I didn't have any of those is this fabulous Hershey's recipe I found back in 1988 (the coupons expiring in '88 are still attached, lol).
Hot Fudge Pudding Cake
1 1/4 c sugar, divided
1 c flour
7 tbsp cocoa, divided
2 tsp baking powder
1/4 tsp salt
1/2 c milk
1/3 c melted butter
1 1/2 tsp vanilla extract
1/2 c packed light brown sugar
1 1/4 c hot water
Preheat oven to 350*. In medium mixing bowl combine 3/4 c sugar, flour, 3 tbsp cocoa, baking powder & salt. Blend in milk, melted butter & vanilla; beat until smooth. Pour batter into square 8x8 pan. In small bowl combine remaining 1/2 c sugar, brown sugar, & remaining 4 tbsp cocoa; sprinkle mixture evenly over batter. Pour hot water over top; DO NOT STIR. Bake 40 minutes or until center is almost set. Let stand 15 minutes; spoon into dessert dishes, spooning sauce from bottom of pan over cake. Garnish with whipped topping or ice cream as desired.
This recipe is supposed to be 8-10 servings but our family of 5 always manages to finish it off!!