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

Cream together the unsalted butter, granulated sugar, and brown sugar in a large bowl using an electric mixer.

Add eggs one at a time, mixing in vanilla extract until smooth.

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

Gradually combine the dry ingredients with the wet mixture until just mixed.

Fold in any optional nuts or chocolate chips if desired.

Mix together all ingredients for the streusel topping until crumbly.

Scoop tablespoon-sized portions of dough onto baking sheets and top with streusel.

Bake for 10-12 minutes until edges are golden.

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