Easy Vegetarian Enchiladas

Ingredients (9)

• + 2 tablespoons vegetable oil add to pantry
• + 1 cup chopped onion add to pantry
• + 2 (8 ounce) cans diced tomatoes add to pantry
• + 1 (8 ounce) can tomato sauce add to pantry
• + 1 clove garlic, minced add to pantry
• ✓ 1 (14 ounce) can refried beans
• + ¾ cup sliced black olives, divided add to pantry
• + ¾ cup shredded Mexican cheese blend, divided add to pantry
• + 8 (8 inch) flour tortillas add to pantry