Making Classic Cannoli Squares can be straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease an 8×8 inch baking dish.
2. Prepare Dough: In a large bowl, whisk together the flour, granulated sugar, salt, and baking powder.
3. Mix Wet Ingredients: In another bowl, cream the softened butter with the dry mixture until crumbly.
4. Add Egg Yolk: Incorporate the egg yolk and vanilla extract into the flour mixture until combined.
5. Press the Dough: Press about two-thirds of the dough into the bottom of the greased baking dish evenly.
6. Bake the Base: Bake the dough in the preheated oven for 15-20 minutes, or until lightly golden.
7. Make Filling: While the base is baking, in a medium bowl, combine the drained ricotta cheese, powdered sugar, additional vanilla extract, orange zest, and mix until smooth.
8. Add Chocolate Chips: Fold in the mini chocolate chips gently until evenly distributed.
9. Spread the Filling: Once the crust has cooled, spread the ricotta filling evenly over the baked layer.
10. Crumb Topping: Crumble the remaining dough over the ricotta filling, distributing it evenly.
11. Bake Again: Return the baking dish to the oven and bake for an additional 25-30 minutes, or until the topping is golden brown.
12. Cool Completely: Allow the squares to cool completely in the pan before slicing.
13. Dust with Powdered Sugar: Before serving, dust with powdered sugar for an elegant touch.

Following these steps will lead you to a batch of delicious Classic Cannoli Squares!