Slow-Cooker Beef Chili

Name: Slow-Cooker Beef Chili
Prep time: 15 min
Total time: 15 min
Cuisine: American
Ingredients: 1 tbsp. vegetable or canola oil; 1 large yellow onion, chopped (about 1 1/2 c.); Kosher salt; 4 cloves garlic, finely chopped; 2 tbsp. tomato paste; 2 lb. (85% lean) ground beef; Freshly ground black pepper; 2 tbsp. chili powder; 1 tbsp. ground cumin; 2 tsp. smoked paprika; 1 tsp. dried oregano; Pinch of cayenne pepper or chipotle chili powder (optional); 2 (15-oz.) cans kidney beans, drained, rinsed; 1 (28-oz.) can crushed tomatoes; 1 c. beer, low-sodium beef broth, or water; 1 lime, halved; Fritos, shredded cheddar, thinly sliced scallions, and sour cream, for serving (optional)