Preheat the oven to 375°F. Line baking sheets with parchment paper.
In a large bowl, beat butter, shortening, and sugar until creamy.
1/2 cup salted butter, 4 Tablespoons vegetable shortening, 1 cup (200g) granulated sugar
Add eggs, milk, and vanilla. Beat until combined. Scrape bottom and sides of bowl.
2 large eggs, 2 Tablespoons milk, 1 teaspoon vanilla extract
Add flour, baking powder, baking soda, and salt. Mix until combined.
2 1/4 cups (317g) all-purpose flour, 1 teaspoon baking powder, 1/2 teaspoon baking soda, 1/2 teaspoon salt
Add pecans, dates, and chopped maraschino cherries. Mix just until combined.
1 cup chopped pecans, 1 cup dates, 1/3 cup maraschino cherries
Fill a shallow dish with crushed cornflakes. Quarter the 12 remaining maraschino cherries.
3 cups crushed cornflakes cereal
Drop small balls of dough onto cornflakes. Roll in cornflakes to coat, then transfer to prepared baking sheets. Repeat with remaining cookie dough. Top each ball of dough with one quarter of a maraschino cherry.
Bake for 10-12 minutes until lightly browned around the edges. Cool before serving.