Roasted Cherry Tomato and Sweet Onion Cheese Dip Recipe

about 8 oz of cherry tomatoes (, depending on baking dish you use & how many tomatoes you need to cover the dip)

/ 225-g) package cream cheese (at room temperature)

freshly grated Parmesean

mayo (preferably Best Foods brand)

medium sweet onion (, diced (about 1 and 1/2 cups))

freshly cracked black pepper