The problem with most dessert lists is that they are sorted by ingredient. Chocolate ones together, fruit ones together, and you scroll through forty of them at nine at night trying to work out which one you can actually manage.
That is the wrong sort order.
What you really want to know is how long it takes and how much attention it needs. So this list runs roughly from a two minute dessert you can make while the kettle boils to a couple that need an afternoon in the fridge but almost no work from you.
The thing that ruins most easy desserts

Overcooking. Almost every simple dessert failure I have had came down to sixty extra seconds somewhere. Mug cakes turn to rubber, cookies go from chewy to sandy, chocolate seizes, and roasted fruit collapses into mush.
Simple recipes have less margin than complicated ones, because there is nothing else in there to hide behind. And the second thing, which took me longer to notice, is salt. A quarter teaspoon of flaky salt in a chocolate dessert or on top of cookies makes the whole thing taste more like itself. I noticed it most with the peanut butter cookies further down, where the version with salt tastes like a bakery cookie and the version without tastes flat and sweet.
1. Affogato
Two scoops of good vanilla ice cream in a small glass, one hot shot of espresso poured over the top at the table. That is the entire recipe and it takes ninety seconds. Use a proper glass and pour it in front of whoever you are feeding, since half the appeal is watching it happen.
2. Macerated berries with whipped cream
Toss two cups of berries with two tablespoons of sugar and a squeeze of lemon, then leave them for twenty minutes while they release their juices into a syrup. Whip a cup of cold cream to soft peaks and spoon it over. Chill your bowl and beaters in the freezer for five minutes first, because cold equipment whips cream noticeably faster.
3. Salted chocolate bark

Melt eight ounces of dark chocolate, spread it thin on parchment, and scatter over whatever you have, toasted nuts, dried fruit, crushed pretzels, flaky salt. Chill for thirty minutes and snap it into pieces. Melt the chocolate at fifty percent power in twenty second bursts, since overheated chocolate goes grainy and there is no way back.
4. Three ingredient peanut butter cookies

One cup of peanut butter, one cup of sugar, one egg, mixed and rolled into balls, flattened with a fork. Bake at 350 degrees Fahrenheit for 10 minutes and let them cool on the tray, because they are fragile straight out of the oven. Flaky salt on top before baking is what takes these from fine to genuinely good.
5. Chocolate mug cake that is not rubbery
Four tablespoons flour, three tablespoons sugar, two tablespoons cocoa, a quarter teaspoon baking powder, three tablespoons milk, two tablespoons oil, and a pinch of salt. Microwave 60 to 70 seconds and no longer. This is the dessert people give up on, and the reason is almost always that they cooked it for ninety seconds and got a hockey puck.
6. No churn ice cream

Whip two cups of cold heavy cream to stiff peaks, then fold in one fourteen ounce can of sweetened condensed milk and any flavouring. Freeze six hours in a loaf tin. No machine, no custard, and the texture is genuinely good because the condensed milk stops large ice crystals forming.
7. Roasted stone fruit
Halve four peaches or plums, place cut side up with a small knob of butter and a teaspoon of brown sugar in each hollow, and roast at 400 degrees for 20 to 25 minutes. Serve warm with cream or ice cream. This works beautifully on fruit that is slightly underripe, which is most supermarket stone fruit.
8. Fruit crumble with a ratio you can remember

Equal parts flour, rolled oats, and brown sugar, about three quarters of a cup each, rubbed into six tablespoons of cold cubed butter until clumpy. Pile over four cups of fruit and bake at 375 for 35 to 40 minutes. Cold butter is what gives you crumbs instead of a paste, so do not let it soften.
9. Panna cotta that looks like you tried
Sprinkle one packet of gelatin over three tablespoons of cold milk and leave five minutes to bloom. Heat two cups of cream with a third of a cup of sugar until steaming but not boiling, stir the gelatin in off the heat, pour into glasses, and chill four hours. Fifteen minutes of actual work for a dessert people assume is difficult.
10. Icebox cake
Layer plain crisp cookies with sweetened whipped cream in a loaf tin or on a plate, cover, and refrigerate overnight. The cookies soften into cake layers and it slices cleanly the next day. Make it the night before something, since this is the rare dessert that genuinely requires no oven and no skill at all.
11. Chocolate ganache mousse
Pour one cup of hot cream over eight ounces of chopped chocolate, wait two minutes, then stir until smooth and let it cool to room temperature. Fold that into another cup of cream whipped to soft peaks. Two ingredients, one bowl, and it sets in about three hours in the fridge.
12. Skillet cookie for sharing
Any cookie dough pressed into a buttered eight inch skillet and baked at 350 for 18 to 22 minutes, then eaten warm from the pan with spoons. Pull it while the centre still looks slightly underdone, because it keeps cooking in the hot pan for a good five minutes after it comes out.
How to pick one and what to keep stocked
Sort by the time you have and work backwards. If you have five minutes, it is the affogato, the berries, or the bark. If you have twenty minutes of work and a few hours of waiting, make the panna cotta, the mousse, the no churn ice cream, or the icebox cake, and note that all four of those are actually better made ahead, so they are the right answer when you are feeding people. If you want something warm and just baked, go with the crumble, the skillet cookie, the peanut butter cookies, or the roasted fruit. On stocking, a handful of things means you can make something from this list at almost any time. Dark chocolate, a can of sweetened condensed milk, heavy cream, a packet of gelatin, rolled oats, brown sugar, a jar of peanut butter, and a tub of vanilla ice cream in the freezer covers eleven of the twelve. Frozen berries work fine for the crumble and the macerated fruit, so you do not need fresh on hand. And the one habit worth building is checking things early. Set your timer for the shortest time in the range, look, and add more if needed, because you can always bake something for another three minutes and you can never unbake it.
Frequently asked questions

What is the easiest dessert to make with no baking? An affogato takes under two minutes and needs no cooking at all. For something that feeds a group, an icebox cake made from cookies and whipped cream requires only assembly and a night in the fridge.
What desserts can I make with almost no ingredients? Three ingredient peanut butter cookies need only peanut butter, sugar, and an egg. No churn ice cream needs whipped cream and sweetened condensed milk, and chocolate ganache mousse needs only chocolate and cream.
How do I keep my mug cake from turning rubbery? Cook it for 60 to 70 seconds and stop there. Microwave power varies, so check at 60 seconds and add ten second bursts if needed, since even twenty extra seconds turns the crumb dense and dry.
What easy desserts can I make ahead for guests? Panna cotta, chocolate mousse, icebox cake, and no churn ice cream all need to be made hours in advance, which makes them ideal. All four improve with a longer chill and free you up entirely on the day.
Why did my chocolate go grainy when I melted it? It either got too hot or a drop of water got in. Melt in twenty second bursts at fifty percent power, stirring between each, and keep every utensil completely dry.
Final thoughts
The desserts I actually make on a regular weeknight are not the impressive ones. They are the ones I can start without checking a recipe, usually involving chocolate, cream, or whatever fruit is going soft in the bowl on the counter.
So pick one that matches the energy you have right now rather than the one that looks best. If you try the panna cotta, come back and tell me how it went, because that is the one with the biggest gap between how hard it is and how impressive it looks.