Preheat oven to 350 degrees F. Spray a mini Bundt pan with non stick baking spray.
In a medium bowl, combine brown sugar and melted butter. Divide between muffin tins. Also, add one pineapple slice and one cherry to each.
In a large bowl, combine flour, salt, and baking powder.
In another large bowl, cream butter and sugar until light and fluffy. Add vanilla, and eggs one at a time.
Alternate adding in flour mixture and milk until everything is just combined.
Divide evenly between prepared pans. Bake for 18-22 minutes.
Cool before flipping over.
Notes
Ingredient Notes:
Flour: Measure your flour by spooning it into a measuring cup and leveling it with a spoon. Avoid dipping your cup into the flour as you'll likely use too much, which will lead to a dense, dry cake.
Butter: You want your butter to be softened but not melted. If your finger makes an indent when you press it, it is ready to use.
Pineapple: Be sure to drain in a strainer to remove excess moisture. Then pat dry with paper towels. I would not suggest using fresh pineapple here as it may be too juicy.
Marachino Cherries: These can be tricky to find at the store. Try looking in the cocktail mixer section or near the ice cream cones.
Tips
Don't overmix your batter: This can lead to tough dense cupcakes.
Don't Overbake: Cupcakes are done when a toothpick inserted in the center comes out with a with just a few moist crumbs. It's okay if it's not totally clean.
Don't Overfill: Fill your cupcake pan only around ⅔ of the way full. They'll rise as they bake. You don't want them to overflow and make a mess!
Perfect Flipping: I suggest turning them upside down onto a baking sheet or wire rack around 5-10 minutes after removing them from the oven. If they don't come out immediately, let gravity do its work. You can also try gentling and loosening with a butter knife.