Preheat your oven to 350°F (175°C). Line a muffin pan with cupcake liners and prepare your favorite vanilla or chocolate cupcake batter. Fill each liner about two-thirds full, ensuring even baking. Bake for 15-20 minutes until a toothpick inserted in the center comes out clean. Once done, transfer the cupcakes to a wire rack to cool completely for best decorating results.

In a large mixing bowl, beat 1 cup of softened unsalted butter with an electric mixer until creamy, about 2-3 minutes. Gradually add 4 cups of sifted powdered sugar, mixing on low speed to avoid a sugar cloud. Pour in 2 tablespoons of milk for a fluffy texture, adjusting as needed. Continue to beat on high for an additional 2-3 minutes until light and airy.

Divide the buttercream frosting into small bowls based on the colors you'd like to create. Add a few drops of food coloring gel to each bowl, mixing until you reach the desired hues. Prepare a light green or mint color for foliage.

Fit a piping bag with a round tip for roses and a petal tip for peonies. Start with the rose by piping a small swirl in the center and encircling it with additional layers. For peonies, create overlapping petals outward from a central point.

Begin to arrange your cupcakes closely together to mimic a bouquet. Use varying heights and spacing to create a natural look, adding small leaves made from the green frosting in between.

After arranging your Flower Bouquet Cupcakes, step back to assess the display. Make adjustments for a tight bouquet look, emphasizing the arrangement’s visual balance by showcasing vibrant flowers at focal points.