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Stir together the first three ingredients in a small saucepan. Cook over medium heat, stirring occasionally, about 5 minutes or until mixture starts to thicken. Make sure to cook until all of the cornstarch is dissolved, and the mixture starts to take on a glossy or translucent appearance.
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Remove from heat, stir in butter and vanilla.
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When the cupcakes are still warm, using a spatula, spread the pineapple glaze on top of the cupcakes. Try to spread the glaze on so the middle of the cupcake is mounded with the glaze a bit.
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Glaze all of the cupcakes. If there is any leftover glaze, go over the cupcakes again lightly, using remaining glaze. Set aside.