01 -
Heat the oven to 375°F.
02 -
Cook twenty jumbo shells to al dente according to the package.
03 -
Drain gently and let cool enough to handle.
04 -
Heat olive oil in a skillet and soften the chopped onion and pepper.
05 -
Add ground beef, garlic powder, salt and pepper. Break into crumbles and cook to 160°F, then drain excess fat.
06 -
Remove from heat and stir in half a cup each of provolone and cheddar.
07 -
Spread half the jar of cheese sauce across a nine-by-thirteen-inch dish.
08 -
Fill the shells and arrange over the sauce.
09 -
Add the remaining sauce and shredded cheeses.
10 -
Cover and bake about twenty minutes, then uncover and bake about ten minutes more, continuing until a central filled shell reaches 165°F. Rest briefly before serving.