Wash apple
Peel apple & slice it into thin slices
Grab a small bowl
Add 1/2 tsp melted butter to bowl
Add 1/4 tsp cinnamon to bowl
Add 1 tsp brown sugar to bowl
Add 1 tsp flour to bowl
Mix all ingredients together
Grab another small bowl
Add 1 tbsp flour to bowl
Add 3 tbsp old fashioned oats to bowl
Add 1 tbsp brown sugar to bowl
Add 1/4 tsp cinnamon to bowl
Add 2 tbsp soft butter to bowl and use a fork to work in butter
Add 1 spoon full of apple filling to bottom of mug
Add 1 spoon full of crisp filling on top
Continue this pattern until all fillings are in the mug
Place in microwave for 3 minutes
Serve with ice cream or whipped cream!