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Preheat oven to 375 degrees F.
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In a mixing bowl cream together butter, shortening, peanut butter, white sugar and brown sugar until light and fluffy, 1-2 minutes. Add and eggs, mixing after each addition. Mix in the vanilla.
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In a separate bowl whisk together flour, baking soda, and salt. Stir dry ingredients into the wet ingredients and mix gently to combine. (Don't overmix!--The dough will be very soft).
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Pour a little bit of granulated sugar into a bowl. Roll dough into 1/2 inch size balls and then roll in sugar. Place on an ungreased cookie sheet and bake for 6-8 minutes, until set, but not browned. You really don't want to over-bake them or they will be hard. Remove from oven and allow to on baking sheet for 2-3 minutes, and then transfer to cooling rack. Add an unwrapped Reese's heart to the center of each cookie.