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

In a large mixing bowl, cream together the unsalted butter, granulated sugar, and brown sugar for 3-4 minutes until light and fluffy.

Add large eggs one at a time, mixing thoroughly. Then stir in the vanilla extract.

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

Gradually mix the dry ingredients into the wet ingredients until just combined.

Fold in optional chopped nuts and mini chocolate chips gently.

For the streusel topping, mix together all-purpose flour, brown sugar, and ground cinnamon; then blend in melted butter until crumbly.

Scoop dough onto baking sheets, leaving 2 inches between each cookie.

Sprinkle streusel topping generously on each cookie dough ball and press down lightly.

Bake for 10-12 minutes or until edges are golden and centers are set.

Cool on baking sheets for 5 minutes before transferring to wire racks to cool completely.