01 - Preheat oven to 350°F and line a 12-cup muffin tin with paper liners.
02 - Whisk flour, baking powder, and salt together in a medium bowl.
03 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, about 2–3 minutes.
04 - Beat in eggs one at a time, mixing well after each addition. Stir in vanilla extract.
05 - Add ricotta cheese to the mixture and blend until just combined.
06 - Gradually add dry ingredients to wet mixture, alternating with the milk, beginning and ending with flour mixture. Mix until just combined, avoiding overmixing.
07 - In a small bowl, stir together the light brown sugar, ground cinnamon, and melted butter until evenly combined.
08 - Spoon about 1 tablespoon of batter into each cupcake liner. Add 1 teaspoon of cinnamon swirl mixture, then top with remaining batter. Drop another 1/2 teaspoon of cinnamon swirl on top and use a toothpick or skewer to gently swirl.
09 - Bake cupcakes for 20–22 minutes, until a toothpick inserted into the center emerges clean.
10 - Allow cupcakes to cool in the muffin tin for 5 minutes, then transfer them to a wire rack to cool completely.
11 - Mix powdered sugar, milk, and a pinch of cinnamon until smooth. Drizzle glaze evenly over cooled cupcakes.