Peanut Butter & Jelly Cupcakes

¾ cup of Granulated Sugar
½ cup of Vegetable Oil
2 Eggs
2 Tsp of Vanilla Extract
1 Tbsp of Baking Powder
1/8 tsp of Salt
1 1/2 cup of Cake Flour
1/3 cup of Whole Milk

For the filling:
1 cup of Seedless Jam, I use strawberry jam but you can use whatever kind you prefer

For the frosting:
2 to 2 ½ cups of Confectioner Sugar
¼ cup of Unsalted Butter at Room Temperature
1 cup of Smooth Peanut Butter
8 oz Cream Cheese, at room temperature
½ tsp of Vanilla Extract
About 1 Tbsp of Milk, if needed