Preheat oven to 180°C/350°F/Gas 4 and spray a 9 x 13" baking pan with nonstick baking spray. Set aside.
To make the brownies, whisk the melted butter, oil, white, and brown sugar together in a large bowl.
Whisk the eggs and the vanilla extract into the butter and sugar mixture.
Sift or whisk the flour, cocoa, salt, and baking powder into a large bowl until combined.
Gradually whisk the dry ingredients into the wet ingredients.
Fold in the chocolate chips.
Pour batter into the prepared baking pan and bake in the preheated oven for
25-30 minutes or until a toothpick comes out clean.
Leave the pan of brownies to cool completely before cutting into small bite-size (about 2"/5cm) pieces and set aside.
Preheat oven to 180°C/350°F/Gas 4 and line cupcake pans with 24 cupcake liners.
Using an electric handheld or stand mixer, place all of the cupcake ingredients into the mixing bowl and mix until combined and smooth.
Scoop the batter into the liners, filling it about ¾ way full.
Bake in the oven for 20 minutes or until an inserted toothpick comes out clean.
Leave to cool in the pan for 5 minutes before transferring to a wire rack to cool completely before decorating.
Using an electric handheld or stand mixer, place all of the ingredients for the frosting (except the sprinkles) into the mixing bowl and beat until combined, smooth, and can hold a stiff peak.
Scoop the frosting into a large piping bag fitted with an open star tip and set aside.
To make the ganache, place the cream into a small saucepan and bring to a boil on medium heat.
Place the chocolate chips into a medium bowl and pour the hot cream on top. Leave for 1 minute then whisk until smooth.
Pour the ganache into a squeeze bottle or piping bag with the tip cut off.
Drizzle the ganache over the brownie bites and add the heart sprinkles on top. Leave to sit for 30 minutes.
To build the cupcakes, pipe a ring of frosting around the cupcake and cover it with sprinkles.
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Carefully place the brownie bite in the center of the frosting.
Pipe a dollop of frosting in the center of the brownie and add more sprinkles.
Grab a large glass of milk to enjoy with these cupcakes!
Enjoy and Happy Valentine's Day!