Step 1: Stir together Bisquick, sugar, and cinnamon. Add egg, vanilla, and milk, and stir until well combined. It's alright if there are some lumps; these won't matter once it's baked.
Step 2: Pour half the batter into a greased 8x8 pan. Top with chocolate chips in an even layer. Pour remaining batter over the chocolate chips and spread to cover them.
Step 3: Use a fork to stir together topping ingredients, and sprinkle evenly over batter.
Step 4: Bake at 350 degrees for 25-30 minutes until the topping is golden brown and crispy. Cool completely and cut into squares.