7 Layer Bean Dip

Name: 7 Layer Bean Dip
Prep time: 15 min
Total time: 15 min
Cuisine: Mexican
Ingredients: 2 cans refried beans ((black or pinto)); 2 teaspoons chili powder; 1 teaspoon ground cumin; 1/2 teaspoon garlic powder; 3 avocados (, peeled and seeded); 1 Tablespoon lime juice ((or lemon juice)); 8 oz sour cream; 3/4 cup salsa; 1 1/2 cups shredded Mexican blend cheese (, cheddar or Monterrey Jack); 6 ounces sliced black olives; 2 green onions (, chopped); 1 roma tomato (diced, for garnish (optional)); tortilla chips (, for serving)