Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.

Cream together 1 cup of softened unsalted butter with ½ cup of granulated sugar and ½ cup of brown sugar using an electric mixer until light and fluffy.

Add 2 large eggs, one at a time, mixing well after each addition, then add 1 teaspoon of vanilla extract and mix until smooth.

In a separate bowl, whisk together 2 cups of all-purpose flour, 1 teaspoon baking powder, ½ teaspoon baking soda, ½ teaspoon salt, and 2 teaspoons ground cinnamon.

Gradually add the dry ingredients to the wet mixture, mixing on low speed until just combined.

If desired, fold in chopped nuts or mini chocolate chips into the cookie dough.

To make the streusel topping, combine ⅓ cup all-purpose flour, ¼ cup brown sugar, and 1 teaspoon ground cinnamon, then drizzle in 3 tablespoons melted unsalted butter and mix until crumbly.

Drop rounded balls of cookie dough onto the prepared baking sheets, spaced about 2 inches apart.

Sprinkle streusel topping over each cookie dough ball and press gently to adhere.

Bake for 10–12 minutes, until edges are golden brown and centers are soft.

Let cool on the baking sheets for 5 minutes before transferring to wire racks.