Chipotle Burgers

For the burgers:

• 4 hamburger buns
• softened butter, for spreading on buns
• 1 lb ground beef
• 2 chipotle peppers, from a can of chipotles in adobo, minced
• 1 to 2 tablespoons adobo sauce
• 1 teaspoon garlic powder
• 1 teaspoon onion powder
• 1/2 teaspoon ground cumin
• Kosher salt and black pepper, to taste
• 4 slices pepper jack cheese (can use Monterey Jack or Cheddar cheese)

For the chipotle sauce:

• ½ cup plain greek yogurt (can use sour cream or mayonnaise)
• 1 tablespoon lime juice
• 2 teaspoons chipotle in adobo sauce
• ¼ teaspoon smoked paprika
• kosher salt, to taste

For serving:

• lettuce
• Tomato slices
• 1 ripe avocado, sliced