Found from the following blog:
No-Bake Chocolate, Peanut Butter & Oatmeal Cookies
Yield: 2 to 3 dozen cookies
Prep Time: 10 minutes | Cooling Time: 30 minutes
½ cup (1 stick) butter
2 cups granulated sugar
½ cup milk
4 tablespoons cocoa powder
½ cup peanut butter
2 teaspoons vanilla extract
3 cups quick-cooking oats
1. Add the first four ingredients (through the cocoa powder) to a 4-quart saucepan.
2. Bring to a rolling boil and let boil for 1 minute.
3. Remove from heat.
4. Stir in the peanut butter and vanilla until smooth, then stir in the oats.
5. Drop by heaping tablespoons onto wax paper-lined baking sheets.
6. Let cool until set.
(Recipe adapted from Ezra Pound Cake)