This paper applies a program evaluation technique to assess the causal effect of the adoption of improved groundnut technologies on consumption expenditure and poverty measured by headcount, poverty gap and poverty severity indices. The paper is based on a cross-sectional farm household level data collected in 2008 from a sample of 594 households in rural Malawi. A sensitivity analysis is conducted to test the robustness of the propensity score based results using the rbounds test and the mean absolute standardized bias (MASB) between adopters and non-adopters. The analysis reveals robust and positive and significant impacts of improved groundnut variety adoption on per capita consumption expenditure and on poverty reduction. The findings generally provide justification for continued public and private investment in groundnut research and outreach in Malawi.