Sift flour, baking soda, and salt in a basin. Set aside.Mix the butter, brown sugar, and sugar on high for 2 minutes until light and fluffy. Mix in peanut butter and vanilla. Combine. Add eggs and mix on high for 1 minute.
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Scrape bowl to mix.Mix dry ingredients on low until mixed. Include small chocolate chips and chopped mini Reese's. Divided each Reese's in thirds. Cover and chill for 2 ½ hours.
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Preheat oven to 350°F. Prepare two big cookie sheets with parchment. Use a 3 oz cookie scoop (large ice cream scoop) to scoop dough. Put 6 cookies per sheet. Store the remaining dough in the fridge until the next batch.
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Bake 14-16 minutes. Lightly golden brown cookies. Top cookies with small peanut butter cups and chocolate chips. Wait 5 minutes before cooling on a rack.
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