We have a couple of crowd pleasers at our place, things I fall back on when I want happy guests and quick work.
Poor man's pie, one my mom taught me early on. 1 cup each flour, sugar, and milk. Stick of butter, melted. Teaspoon vanilla. Mix, pour into baking dish. Add a can of either pie filling, frozen berries,or drained, tinned fruit (we prefer peaches). Bake at 350/180 until done. I double for a 9x13 and serve with cream/custard/ice cream. Great for when you only have pantry staples
Better than [anything] cake. Bake a 9x13 chocolate cake--I prefer the Hershey's black magic or chocolate wacky cake. While hot, pour sweetened condensed milk and caramel ice cream topping over the cake. Sprinkle with crushed candy bars/Oreos/nuts--your preference. Before serving, top with whipped cream and sprinkle more of your candy. The guys adore it and it rescues an over baked or dry cake if necessary.
I know there are others, I'll just have to think about it