You will not need a lot of previous baking experience or several hours of spare time.
You will need:
4 cups rolled oats
1 cup packed brown sugar
1 cup OR 3/4 cup butter
1/2 cup light corn syrup
1 teaspoon vanilla extract (optional)
1 cup semisweet chocolate chips
3/4 cup peanut butter
You'll also need access to a conventional oven for baking the oatmeal base and something like a stove-top range for melting the chocolate topping.
Preheat oven to 350 degrees Fahrenheit (180 degrees Celsius).
Step 1: Mix Dry Ingredients
4 cups of rolled oats
1 cup of packed brown sugar
Pile the oats into a clean mixing bowl with a measuring. Unlike with flour, your measurements need not be super accurate.
Pack 1 cup of brown sugar into the same measuring cup, and drop the sugar into the mixing bowl with the oats. If you've never packed brown sugar before, it's pretty simple. Pour or scoop some sugar into the measuring cup, and then press it down with your fingers until it feels firm. Keep adding and pressing sugar until you get a 1 full cup of packed brown sugar leveled flat.
Now that you have a mini sugar castle in the mixing bowl, break up the brown sugar, and begin stirring it in with the oats. I find it helpful to start by pushing up the stuff on the bottom. Keep stirring until only a few clumps of brown sugar remain.