Brownies:

 Certainly! Here's a detailed step-by-step guide on how to make brownies:

Ingredients:

• 1/2 cup (1 stick) unsalted butter
• 1 cup granulated sugar
• 2 large eggs
• 1 teaspoon vanilla extract
• 1/3 cup cocoa powder
• 1/2 cup all-purpose flour
• 1/4 teaspoon salt
• 1/4 teaspoon baking powder
• Optional: 1/2 cup chocolate chips, nuts (such as walnuts or pecans)

Instructions:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and line an 8x8-inch (20x20 cm) baking pan with parchment paper, leaving an overhang on two sides to easily lift the brownies out later.                                                                                                                                                    
2. 
   Melt the Butter: In a medium-sized microwave-safe bowl, melt the butter in the microwave in 20-30 second intervals until fully melted. Alternatively, you can melt the butter on the stovetop over low heat.                                                                                  
3. Mix in Sugar: Add the granulated sugar to the melted butter and stir until well combined. The mixture might look a bit gritty, but that's okay.
4. Add Eggs and Vanilla: Beat in the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
   
5. Add Dry Ingredients: Sift the cocoa powder, all-purpose flour, salt, and baking powder into the bowl with the wet ingredients. Gently fold the dry ingredients into the wet ingredients until just combined. Be careful not to overmix, as this can lead to tough brownies.
6. Optional Add-Ins: If you're using chocolate chips or nuts, fold them into the batter.
7. Transfer to Baking Pan: Pour the brownie batter into the prepared baking pan and spread it evenly using a spatula.
8. Bake: Place the pan in the preheated oven and bake for about 20-25 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs clinging to it. The exact baking time can vary, so keep an eye on them to prevent overbaking.
9.  Cooling: Once baked, remove the brownies from the oven and let them cool completely in the pan on a wire rack. This allows them to set and develop their fudgy texture.
   
   
   
10. Cut and Serve: Once the brownies are completely cooled, use the parchment paper overhangs to lift them out of the pan. Place them on a cutting board and use a sharp knife to cut them into squares or rectangles of your desired size.
11. Enjoy: Your homemade brownies are now ready to be enjoyed! Serve them as is or with a scoop of ice cream for an extra treat.

Remember, the baking time can vary based on your oven and the thickness of the brownies, so it's essential to keep an eye on them as they bake. Enjoy your delicious homemade brownies!