You no longer need to keep tempting cookies in the pantry for unexpected company. These Microwave Brownies are easy enough for kids to mix up and bake.
Blend 2 large eggs, 3/4 cup sugar, 1/2 teaspoon salt, and 1 teaspoon vanilla extract with a mixer (hand mixer works fine) for about 1 minute until light.
Add 1/2 cup melted unsalted butter and keep beating.
Mix in 3/4 cup all-purpose flour and 1/2 cup cocoa powder (not Dutched) and 1 teaspoon instant espresso (if using) at low speed just until the flour disappears.
Combine 1/4 cup chopped semi-sweet chocolate or chocolate chips, 1/4 cup chopped nuts and a pinch cinnamon for topping in a small bowl. Either stir the topping into the batter now or sprinkle on top after the batter is put into the baking dish. I like to sprinkle it on top. Looks fancy.
Spread into 8" square, round, or oval glass oven-safe dish. Arrange the batter with the spatula to be somewhat thicker around the edges and corners than in the middle. This helps to even out the baking.
Microwave on HIGH for 3-5 minutes. Watch carefully the first time because every microwave is a bit different. When done, the top looks dry and springs back when lightly touched. If your brownies become tough and chewy as they cool, they overcooked. Food cooked in a microwave continues to cook for a minute or two after removing it from the oven.