In a medium bowl, beat the butter and sugar until light and creamy. Beat means to mix the butter and sugar vigorously with a spoon, fork, or electric mixer.
Add the eggs, one at a time while being sure to blend the mixture well after each addition.
Add the vanilla and mix all together.
Mix the dry ingredients into the butter mixture and then the yogurt. Be sure to mix everything until just combined. Finally, add the chocolate chips.
Spread the batter in the buttered pan and sprinkle the topping mixture of sugar and cinnamon on top. Press down lightly with your hand so the topping does not move when the cake rises.
Bake in the oven for 30 to 40 minutes until done.
My daughter used a toothpick to determine if the cake was done or needed more time. She stuck the toothpick into the cake and if it came out clean it was done, if cake stuck to the toothpick, it needed more time.