Add peanut butter cookies recipe

peanut-butter-cookies.md

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+# Peanut Butter Cookies
+
+Originally from a scanned page of a cookbook in my mom's kitchen.
+
+Makes about 40 cookies.
+
+## Ingredients
+
+- ½ cup butter or shortening, softened (113g)
+- ½ cup firmly packed brown sugar (100g)
+- ½ cup granulated sugar (100g)
+- 1 egg
+- 1 cup peanut butter (240g)
+- ½ teaspoon salt
+- ½ teaspoon baking soda
+- ½ teaspoon vanilla
+- 1 to 1½ cups all-purpose flour (136g to 202g)
+- Hershey's Kisses (optional)
+
+## Preparation
+
+1. Preheat oven to 375°F (190°C).
+1. Beat butter/shortening until soft.
+1. Add sugars gradually, blending until creamy.
+1. Beat in egg, peanut butter, salt, baking soda, and vanilla.
+1. Roll the dough into small balls and then roll the balls in granulated sugar to lightly coat.
+1. Press some of the cookies flat with a fork.
+1. Bake 10 to 12 minutes in the preheated oven. Press a Hershey's Kiss into un-flattened cookies after taking them out.