Peel and smash garlic cloves. Add olive oil and garlic to medium heavy–bottomed saucepan or dutch oven. Set pan over medium heat; cook until garlic cloves are golden brown around edges, 3-5 minutes. Add cashews to pan; cook until fragrant and beginning to brown, 1 minute. Add vegetable broth, cashew milk, salt, nutmeg, black pepper, cayenne, and honey to pan. Bring to a boil over medium–high heat, stirring occasionally. Reduce heat to low; simmer for 15 minutes. Remove pan from heat; stir in cornstarch.