Looking for cookie or cupcake or other sweet treat recipes that do not require any electric mixing?

Electric mixers are a convenience, not a requirement! If you want to develop stamina and muscles, you don't need a mixer. That said, scones, short cake, soda bread, or sweet yeast breads are easily done by hand.

All brownie recipes. Oil based cakes are easier that butter based as you don't have to worry about creaming.

Most butter cake recipes can be made without an electric mixer, just need a little extra elbow grease: cream the butter and sugar with a wooden spoon, add the eggs one at a time, switch to a whisk to incorporate the milk and flour mixtures--makes a denser cake. But cake baking was around long before electric mixers.

These butterscotch brownies, which also happen to be THE best last-minute/late-night baked good ever. You can add chocolate chips if you have them, but they are fantastic on their own http://www.epicurious.com/recipes/food/views/butterscotch-brownies-232678

These brownies are easy & delicious! https://food52.com/recipes/21007-alice-medrich-s-best-cocoa-brownies

Carrot cake....,don't know recipe off the top of my head but it's all mixed in one bowl , makes great cupcakes, rose levey bernbaum recipe is great

Chocolate avocado mousse with raspberries. On foodies website.