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

In a large mixing bowl, combine butter, granulated sugar, and brown sugar, beating on medium speed for about 3-4 minutes.

Add eggs one at a time, mixing well after each, then stir in vanilla extract.

In a separate bowl, whisk together flour, baking powder, baking soda, salt, and cinnamon.

Gradually add the dry mixture to the wet mixture, mixing gently until just combined.

Fold in optional chopped nuts and/or mini chocolate chips.

In a small bowl, prepare streusel topping by mixing flour, brown sugar, cinnamon, and melted butter until crumbly.

Scoop dough onto prepared baking sheets, spacing them about 2 inches apart.

Sprinkle streusel topping generously over each dough ball.

Bake for 10-12 minutes until edges are golden and centers remain soft.

Allow cookies to cool on sheets for 5 minutes before transferring to wire racks.