Prep the Oven and Dry Ingredients: Preheat your oven to 350°F (177°C). Move your oven rack to the middle shelf and line your muffin pan with cupcake liners. In a large bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, ginger, and nutmeg. Set aside.
Mix the Wet Batter: In a separate large mixing bowl, whisk the brown sugar, vegetable oil, and eggs until smooth and most of the sugar is dissolved. Whisk in the crushed pineapple and grated carrots.
Combine and Bake: Add half of the flour mix into the batter and whisk until just combined. Add the remaining flour and mix until just combined. Fold the toasted walnuts in with a spatula. Do not overmix! Use a ¼ measuring cup to scoop batter into each liner (fill only ⅔ full to leave room to rise). Tap the pan on the counter to remove air bubbles. Bake for 25 minutes or until a toothpick comes out clean. (Bake in batches if needed). Cool completely on a wire rack.
Melt and Pipe the Chocolate Nests: Melt the milk chocolate chips in a heatproof bowl in the microwave using 30-second intervals, stirring until completely smooth. Pour the melted chocolate into a piping bag (or zip-top bag) and snip the tip to create a tiny 0.25 cm opening. Line a baking tray with wax paper. Pipe the chocolate directly into the inside bowl of the spoons in overlapping patterns (criss-cross, vertical, horizontal). Ensure the nest is at least 0.5 cm thick so it doesn't break. Save your leftover melted chocolate!
Chill and Release the Nests: Chill the spoons in the refrigerator for a minimum of 1 hour to harden. Wearing food-safe gloves, use a lighter to heat the back (underside) of the spoon with a back-and-forth motion for 10 seconds. Use your thumb to gently slide the chocolate nest forward and out of the spoon's bowl. Keep refrigerated until ready to use.
Make the Cream Cheese Frosting: Place the room-temperature cream cheese and unsalted butter into the bowl of your mixer (or use a hand whisk). Mix until well combined and smooth. Add the salt, vanilla extract, and icing sugar. Mix until the frosting has a completely smooth texture. Store the frosting in an airtight container in the refrigerator for 1 to 24 hours to firm up.
Frost and Decorate: When ready to decorate, give the frosting a good stir and transfer it to a piping bag fitted with your favourite tip (like a #9 swirl tip). Start on the outside edge of the cupcake and pipe the frosting inward in a single, circular layer, swirling the center 2 or 3 times to create height. Place a chocolate nest directly onto the center frosting peak and lightly press it down. Pipe a tiny dot of leftover melted chocolate onto the bottom of a candy egg and "glue" it into the nest. Alternate between placing 2 and 3 eggs per nest, positioning some upright and some sideways for a realistic look!