Preheat oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone baking mats.
In a medium bowl, whisk together flour, baking powder, and salt. Set aside.
In a large bowl, beat softened butter and sugar with an electric mixer on medium-high speed for 2–3 minutes until light and fluffy.
Beat in the egg and vanilla extract until smooth and well combined.
Gradually add dry ingredients to the wet mixture, mixing on low speed just until combined. Don’t overmix.
In a small bowl, mix ¼ cup sugar with 1 teaspoon cinnamon for coating.
Scoop 1 tablespoon portions of dough and roll into smooth balls. Roll each ball in the cinnamon-sugar mixture to coat completely.
Place dough balls on prepared sheets, spacing 2 inches apart. Flatten slightly with your palm or glass bottom. Bake 10–12 minutes until edges are lightly golden.
Cool on baking sheet 5 minutes, then transfer to a wire rack to cool completely before filling.
In a medium bowl, mix drained ricotta, powdered sugar, and cinnamon until smooth. Fold in mini chocolate chips.
Spread 1 tablespoon of filling on the flat side of one cookie. Top with another cookie, pressing gently to sandwich. Repeat with remaining cookies.
Refrigerate filled cookies for 30 minutes before serving to allow the filling to set.